Desperately need help restoring fusion drive on a 2019 iMac.

Question

Level 1

4 points

Desperately need help restoring fusion drive on a 2019 iMac.

Had a hard drive crash. Genius Bar indicated that they no longer repaired this model and recommended a hard drive. Replacement went well. But, initial install of iOS seem to be running only off of the hard drive. Nothing off the flash flash drive, which indicated on Disk Utility that the Apple SSD flash drive was "Uninitialized"

Some quick reading indicated that we needed to open a terminal prompt and enter a set of instructions that would tell the operating system to see the flash drive and the hard drive as one fusion drive. Enter the instructions exactly as indicated. It seemed to begin the process but then gets stuck. Please see the attached photos.

Our first indication that we had a problem was that when we went to install other than the original 2019 iOS, Catalina, it wouldn't allow us to select the single drive that appeared. Ultimately, with the help of Apple tech-support we were able to install a newly downloaded version of sequoia 15.3.2.

All files are backed up the Time Machine and this is a clean install.

How do we proceed from here? Do I try to run the terminal command again?

Any help would be much appreciated

iMac 27″, macOS 10.15

Posted on Apr 1, 2025 6:21 PM

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Answer 1

rkaufmann87

Level 10

147,032 points

Apr 2, 2025 12:22 PM in response to Kkilg

To Fuse the drive please click How to fix a split Fusion Drive - Apple Support

If that does not work, then take the computer to a third party Apple Authorized Service Provider and ask if they can assist. To begin finding one in your general area click the Support link on WWW.Apple.com (it's on the far right).

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Answer 2

Kkilg Author

Level 1

4 points

Apr 4, 2025 1:16 PM in response to HWTech

Thanks for taking the time to help.

See reports from DriveDx. Looks like the SSD is the problem. Although, I'm no expert.

Irreparable?

DriveDx Apple SSD

Drive Dx Toshiba HDD

With this new data, a few questions...

Is there a repair, outside of First Aid?

Worth repairing?

Machine is running Sequoia. Will it ultimately be unbearably slow, once Time Machine image loaded, with no flash access?

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Answer 3

HWTech

Level 9

63,908 points

Apr 3, 2025 9:44 PM in response to Kkilg

If the erase fails, then try erasing it again. I have seen Disk Utility fail to erase a drive on the first attempt, but will be able to erase the drive on the second attempt made immediately after the first failure. If a drive won't successfully be erased after several attempts, then it usually indicates a hardware issue. Also, try erasing the SSD while booted to the macOS installer.

Try running DriveDx (free trial period) to check the health of the SSD and posting the complete text report here using the "Additional Text" icon which looks like a piece of paper on the forum editing toolbar. You may as well post the health report for the Hard Drive as well.

Also, when posting pictures please make sure they are oriented correctly. You can easily rotate pictures on an iPhone/iPad by using the instructions in the following Apple article (I'm sure Android devices have a similar option):

Crop, rotate, flip, or straighten photos and videos on iPhone - Apple Support

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Answer 4

rkaufmann87

Level 10

147,032 points

Apr 4, 2025 1:54 PM in response to Kkilg

For a M4 MM, I'd recommend budgeting about $1350. I'll break it down....

M4 MM with 16GB RAM and 1TB SSD (NEVER GET LESS STORAGE THAN YOU NEED!!!!!) $999. A $700 M4 MM is kind of short sighted.
27" 4K display about $350. (Check on Amazon, they're easy to find.)

The good news is you can finance the MM for no interest for 12 months if you buy directly from Apple. 12 payments of approximately $85 per month. If you go that route it makes the purchase much more palatable! If you don't know how to do that you can call Apple's on-line store or if you have an Apple Store in your general area they can assist.

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Answer 5

Kkilg Author

Level 1

4 points

Apr 3, 2025 6:11 PM in response to HWTech

OK. Have to admit to this guidance making me a bit nervous. I can recall trying this using a similar set of instructions, as above and having difficulty reinstalling a more updated version of the iOS. Also, I was uncertain what format to use for both drives. At one point, it wouldn't allow me to successfully format the flash drive, in any GUID, even though it passed First Aid.

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Answer 6

HWTech

Level 9

63,908 points

Apr 3, 2025 9:23 AM in response to Kkilg

Make sure that both the internal HD and SSD are not mounted. You can do this in the Disk Utility GUI app.

Theoretically you should then be able to launch the Terminal app and issue the command to reset the Fusion Drive. If you still have problems, then I would go back to Disk Utility and erase both of the internal drives, before trying the Terminal command again.

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Answer 7

rkaufmann87

Level 10

147,032 points

Apr 3, 2025 9:33 PM in response to Kkilg

My question is:

If you really want to save your computer (meaning not wanting to replace it) then why don't you simply take it to a qualified professional that knows what they are doing? In other words please take it to an Apple Authorized Service Provider rather than attempting to do-it-yourself! Don't tell us you are trying to save money, we read all the time of incompetent do-it-yourselfers that totally mess up their system rather attempting to save money, when they end up spending far more by trying to do-it-themselves and then making a total mess.

At least take it in, get an estimate and then you can make a more educated decision!!!!!!

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Answer 8

Kkilg Author

Level 1

4 points

Apr 4, 2025 12:24 PM in response to rkaufmann87

I appreciate the sentiment,. And, yes, money is a factor. I did reach out to my local Apple authorized. He indicated the assessment and repair would be somewhere in the neighborhood of $400. As I'm sure you know, I can get a Mac mini for $700. This is what the Mack genius recommended. Junking this setup, since Apple has abandoned them. i would love to keep these big beautiful 27 inch monitors, in a useful state. Hard one. Would welcome your input. If my case is already at the point which you find it beyond reason, I'd welcome the direct advice, as well. Completely understand if you don't respond. Wasn't my intent to annoy anyone. Ideally, this forum is for people like me.

Your forbearance is appreciated.

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Answer 9

HWTech

Level 9

63,908 points

Apr 4, 2025 2:24 PM in response to Kkilg

The DriveDx reports were not properly attached. You need to copy the text from the DriveDx report and paste it into the "Additional Text" box. You cannot copy & paste the file or drag & drop the file here.

Definitely curious about the SSD since it seems there may be some issues with it.

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Answer 10

HWTech

Level 9

63,908 points

Apr 4, 2025 7:05 PM in response to Kkilg

Very interesting health report for that SSD. I've never seen one quite like it before. Parts of the health information appear to be corrupted and/or out of bounds. No wonder you are having issues with that SSD.

If that SSD was installed in any older Mac, then I would suggest trying to perform a reset of the SSD by using the SSD's built in hardware Secure Erase feature which besides wiping the SSD completely, it also will reset the SSD to factory defaults. I have "fixed" many SSDs this way which were encountering odd glitches/issues. However, the only way to do this by booting the computer with Linux & using a special Linux command line utility to activate the SSD's built-in hardware Secure Erase feature. Unfortunately Linux support of the USB-C Macs is very poor....I don't know if or how well Linux may function on this 2019 iMac. Plus there is a chance of completely bricking the SSD although this SSD is certainly not able to be used in its current state.

Of course your new internal Hard Drive is completely healthy with just a bit over 100 hours of use.

You will either need to run macOS from the slow internal Hard Drive, or you could install macOS to an external USB3 SSD so you run the iMac from the external SSD instead. The external USB3 SSD will be much faster than booting from the internal Hard Drive (assuming you have a good quality external SSD since many SSDs these days can be quite slow when writing....sometimes making a Hard Drive look fast).

Sorry for the bad news. It is also one of the few times DriveDx has actually revealed a bad SSD since most SSD failures are due to the SSD's controller which has no health monitoring.

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Answer 11

Apr 4, 2025 7:23 PM in response to Kkilg

I noticed your trying to format an SSD. They have limited life and you don't manage it the same way that a HD would be used. Using a new disk partition may make the drive unusable. You can't defrag an digital SSD drive. If this drive is removable then try and use a linux disk recovery app on it like kde-partition manager. If it's formatted as APFS the only macOS disk-utility can fix it. From your screenshots. I'd say you wiped your drives' containers so try to create a new one with disk-utility first. Avoid format as SSD don't do well with these old tools. I have bricked a few trying to recover the partition with format. good luck.

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Answer 12

Kkilg Author

Level 1

4 points

Apr 4, 2025 4:04 PM in response to HWTech

DriveDx Apple SSD

### SYSTEM INFORMATION ### Report Timestamp : April 4, 2025 3:51:47 PM EDT Report Timestamp (ISO 8601 format) : 2025-04-04T15:51:47 Application Name : DriveDx Application Version : 1.12.1.760 Application SubBuild : 0 Application Edition : Standalone Application Website : https://binaryfruit.com/drivedx DriveDx Knowledge Base Revision : 103/103 Computer Name : Keith’s iMac Host Name : Keiths-iMac Computer Model : iMac19,1 OS Boot Time : 2025-03-19T15:55:52 Time Since Boot : 15 days 23h 55m 55s OS Name : macOS OS Version : 15.3.2 OS Build : 24D81 OS Kernel Version : Darwin 24.3.0 SAT SMART Driver Version : N/A ATA Command Support Tolerance : verypermissive N of drives in report : 1 ### DRIVE 1 OF 1 ### Last Checked : April 4, 2025 3:51:03 PM EDT Last Checked (ISO 8601 format) : 2025-04-04T15:51:03 Advanced SMART Status : OK Overall Health Rating : GOOD 100% SSD Lifetime Left Indicator : BAD 0% Issues found : 2 Serial Number : S4E2NY0M300930 WWN Id : Volumes : Device Path : /dev/disk1 Total Capacity : 121.3 GB (121,332,826,112 Bytes) Model Family : Apple/Samsung NVMe L-series SSD Model : APPLE SSD SM0128L Firmware Version : ERRORMOD Drive Type : SSD Power On Time : 11,550 hours (16 months 1 days 6 hours) Power Cycles Count : 1,075 Current Power Cycle Time : 383.9 hours === DEVICE CAPABILITIES === S.M.A.R.T. support enabled : yes DriveDx Active Diagnostic Config : Apple/Samsung NVMe SSD L-series config [ssd.nvme.apple.sm.l] Sector Logical Size : 4096 Sector Physical Size : 4096 Physical Interconnect : PCI-Express (PCIe) Logical Protocol : NVM-Express (NVMe) Removable : no Ejectable : no NVMe Revision Supported : 1.10 PCI Vendor Id : 0x144d Thermal Throttling Supported : no Volatile Write Cache Supported : yes Maximum Data Transfer Size : 256 Pages Log Page Attributes : 0x0 Format NVM Attributes : 0x3 Optional Admin Command Support : 0x0 Optional NVM Command Support : 0x1f (Compare, Wr_Unc, DS_Mngmt, Wr_Zero, Save/Sel_Feat) Number of Power States Supported : 2 Error Log Page Entries : 63 Keep Alive Support : 0 Total NVMe Capacity : - Unallocated NVMe Capacity : - Number of NVMe Namespaces : 1 I/O Path : IOService:/AppleACPIPlatformExpert/PCI0@0/AppleACPIPCI/RP17@1B/IOPP/SSD0@0/IONVMeController/IONVMeBlockStorageDevice@1 [Known device ]: yes [Drive State Flags ]: 0x20000280 [Last State Change Timestamp ]: 2025-04-04T15:49:54 [Last State Change Flags ]: 0x20000280 [Last State Change Diff Flags ]: 0x1 Last Email Report Timestamp : 2025-04-04T15:49:54 Last Email Report Reason Flags : 0x20000280 Last Email Report State Change Flags : 0x1 === CURRENT POWER CYCLE STATISTICS === Time since computer startup : 383 hours Data Read : 0 bytes (0 B) Data Written : 0 bytes (0 B) Data Read/hour : 0 B/hour Data Write/hour : 0 B/hour Operations (Read) : 18 Read IOPS : 962 Operations (Write) : 0 Write IOPS : 0 Throughput per operation (Read) : 0 B/Op Latency Time (Read) : 0 ns Latency Time (Write) : 0 ns Retries (Read) : 0 Retries (Write) : 0 Errors (Read) : 18 Errors (Write) : 0 === PROBLEMS SUMMARY === Failed Indicators (life-span / pre-fail) : 0 (0 / 0) Failing Indicators (life-span / pre-fail) : 0 (0 / 0) Warnings (life-span / pre-fail) : 1 (0 / 1) I/O Error Count : 18 (18 / 0) === IMPORTANT HEALTH INDICATORS === ID NAME RAW VALUE STATUS 7 Data Units Written 404,551,440 (207.1 TB) 100% OK 14 Media and Data Integrity Errors 183 100% Warning === TEMPERATURE INFORMATION (CELSIUS) === Current Temperature : 4.29497e+09 Power Cycle Min Temperature : 4.29497e+09 Power Cycle Max Temperature : 4.29497e+09 Lifetime Min Temperature : 4.29497e+09 Lifetime Max Temperature : 4.29497e+09 Recommended Min Temperature : 5 Recommended Max Temperature : 65 Temperature Min Limit : 5 Temperature Max Limit : 70 === DRIVE HEALTH INDICATORS === ID | NAME | TYPE | UPDATE | RAW VALUE | VALUE | THRESHOLD | WORST | LAST MODIFIED | STATUS 2 Composite Temperature Life-span online 0xFFFFFEEF (4,294,967,023 °C) 373 0 373 - 100% OK 3 Available Spare Pre-fail online 0 0 10 0 - 100% OK 5 Life Percentage Used Life-span online 255 0 0 0 - 100% OK 6 Data Units Read Life-span online 686,755,717 (351.6 TB) 100 0 100 - 100% OK 7 Data Units Written Life-span online 404,551,440 (207.1 TB) 100 0 100 - 100% OK 8 Host Read Commands Life-span online 40,006,908,517 100 0 100 - 100% OK 9 Host Write Commands Life-span online 9,622,963,314 100 0 100 - 100% OK 10 Controller Busy Time Life-span online 59,471 (59,471 minutes) 100 0 100 - 100% OK 11 Power Cycles Life-span online 1,075 100 0 100 - 100% OK 12 Power On Hours Life-span online 11,550 (11,550 hours) 100 0 100 - 100% OK 13 Unsafe Shutdowns Life-span online 285 100 0 100 - 100% OK 14 Media and Data Integrity Errors Pre-fail online 183 100 0 100 - 100% Warning 15 Error Information Log Entries Pre-fail online 0 100 0 100 - 100% OK 16 Warning Composite Temperature Time Life-span online 0 (0 minutes) 100 0 100 - 100% OK 17 Critical Composite Temperature Time Life-span online 0 (0 minutes) 100 0 100 - 100% OK === DRIVE ERROR LOG === error log is empty

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Answer 13

Kkilg Author

Level 1

4 points

Apr 4, 2025 4:16 PM in response to HWTech

DrivbeDx Toshiba HDD

### SYSTEM INFORMATION ### Report Timestamp : April 4, 2025 3:51:56 PM EDT Report Timestamp (ISO 8601 format) : 2025-04-04T15:51:56 Application Name : DriveDx Application Version : 1.12.1.760 Application SubBuild : 0 Application Edition : Standalone Application Website : https://binaryfruit.com/drivedx DriveDx Knowledge Base Revision : 103/103 Computer Name : Keith’s iMac Host Name : Keiths-iMac Computer Model : iMac19,1 OS Boot Time : 2025-03-19T15:55:52 Time Since Boot : 15 days 23h 56m 04s OS Name : macOS OS Version : 15.3.2 OS Build : 24D81 OS Kernel Version : Darwin 24.3.0 SAT SMART Driver Version : N/A ATA Command Support Tolerance : verypermissive N of drives in report : 1 ### DRIVE 1 OF 1 ### Last Checked : April 4, 2025 3:51:03 PM EDT Last Checked (ISO 8601 format) : 2025-04-04T15:51:03 Advanced SMART Status : OK Overall Health Rating : GOOD 100% Overall Performance Rating : GOOD 100% Issues found : 0 Serial Number : 84N0A06HFWAJ WWN Id : 5 000039 d78d8ddc2 Volumes : Untitled Device Path : /dev/disk0 Total Capacity : 8.0 TB (8,001,563,222,016 Bytes) Model : TOSHIBA HDWG780UZSVA Form Factor : 3.5 inches Firmware Version : 0501 Drive Type : HDD 7200 rpm Power On Time : 108 hours (4 days 12 hours) Power Cycles Count : 1,089 Current Power Cycle Time : 383.9 hours === DEVICE CAPABILITIES === S.M.A.R.T. support enabled : yes DriveDx Active Diagnostic Config : Base config [hdd.default] Sector Logical Size : 512 Sector Physical Size : 4096 Physical Interconnect : SATA Logical Protocol : SATA Removable : no Ejectable : no ATA Version : ACS-4 T13/BSR INCITS 529 revision 5 SATA Version : SATA 3.3, 6.0 Gb/s (current: 6.0 Gb/s) I/O Path : IOService:/AppleACPIPlatformExpert/PCI0@0/AppleACPIPCI/SATA@17/AppleIntelPchSeriesAHCI/PRT0@0/IOAHCIDevice@0/AppleAHCIDiskDriver/IOAHCIBlockStorageDevice Attributes Data Structure Revision : 16 SMART Command Transport (SCT) flags : 0x3d SCT Status supported : yes SCT Feature Control supported : yes SCT Data Table supported : yes Error logging capabilities : 0x1 Self-tests supported : yes Offline Data Collection capabilities : 0x5b Offline Data Collection status : 0x80 Auto Offline Data Collection flags : 0x1 [Known device ]: no [Drive State Flags ]: 0x0 === CURRENT POWER CYCLE STATISTICS === Time since computer startup : 383 hours Data Read : 25,588,272,640 bytes (25.6 GB) Data Written : 38,407,434,240 bytes (38.4 GB) Data Read/Write Ratio : 0.67 Data Read/hour : 66.6 MB/hour Data Write/hour : 100.0 MB/hour Operations (Read) : 2,349,716 Read IOPS : 57 Operations (Write) : 1,065,550 Write IOPS : 26 Operations Read/Write Ratio : 2 Throughput per operation (Read) : 10.9 KB/Op Throughput per operation (Write) : 36.0 KB/Op Latency Time (Read) : 0 ns Latency Time (Write) : 0 ns Retries (Read) : 0 Retries (Write) : 0 Errors (Read) : 0 Errors (Write) : 0 === PROBLEMS SUMMARY === Failed Indicators (life-span / pre-fail) : 0 (0 / 0) Failing Indicators (life-span / pre-fail) : 0 (0 / 0) Warnings (life-span / pre-fail) : 0 (0 / 0) Recently failed Self-tests (Short / Full) : 0 (0 / 0) I/O Error Count : 0 (0 / 0) Time in Under temperature : 0 minutes Time in Over temperature : 0 minutes Number of Mechanical Start Failures : 0 Overlimit Shock Events Count : 0 === IMPORTANT HEALTH INDICATORS === ID NAME RAW VALUE STATUS 5 Reallocated Sector Count 0 100% OK 197 Current Pending Sector Count 0 100% OK 198 Offline Uncorrectable Sector Count 0 100% OK 199 UDMA CRC Error Count 0 100% OK 241 Total LBAs Written 8,099,325,514 (4.1 TB) 100% OK === TEMPERATURE INFORMATION (CELSIUS) === Current Temperature : 24 Power Cycle Min Temperature : 21 Power Cycle Max Temperature : 24 Lifetime Min Temperature : 16 Lifetime Max Temperature : 47 Recommended Min Temperature : 10 Recommended Max Temperature : 60 Temperature Min Limit : 5 Temperature Max Limit : 60 === DRIVE HEALTH INDICATORS === ID | NAME | TYPE | UPDATE | RAW VALUE | VALUE | THRESHOLD | WORST | LAST MODIFIED | STATUS 1 Raw Read Error Rate Pre-fail online 0x0 100 50 100 - 100% OK 2 Throughput Performance Pre-fail offline 0 100 50 100 - 100% OK 3 Spin Up Time Pre-fail online 7,632 100 1 100 - 100% OK 4 Start Stop Count Life-span online 1,098 100 0 100 - 100% OK 5 Reallocated Sector Count Pre-fail online 0 100 10 100 - 100% OK 7 Seek Error Rate Pre-fail online 0x0 100 50 100 - 100% OK 8 Seek Time Performance Pre-fail offline 0 100 50 100 - 100% OK 9 Power On Hours Life-span online 109 100 0 100 - 100% OK 10 Spin Retry Count Pre-fail online 0 100 30 100 - 100% OK 12 Power Cycle Count Life-span online 1,089 100 0 100 - 100% OK 191 G-Sense Error Rate Life-span online 0 100 0 100 - 100% OK 192 Power-Off Retract Count Life-span online 30 100 0 100 - 100% OK 193 Load Cycle Count Life-span online 1,103 100 0 100 - 100% OK 194 Temperature (Celsius) Life-span online 24 100 0 100 - 100% OK 196 Reallocated Event Count Pre-fail online 0 100 10 100 - 100% OK 197 Current Pending Sector Count Life-span online 0 100 0 100 - 100% OK 198 Offline Uncorrectable Sector Count Life-span offline 0 100 0 100 - 100% OK 199 UDMA CRC Error Count Life-span online 0 200 0 200 - 100% OK 220 Disk Shift Life-span online 393,216 100 0 100 - 100% OK 222 Loaded Hours Life-span online 108 100 0 100 - 100% OK 226 Load-in Time Life-span online 677 100 0 100 - 100% OK 240 Head Flying Hours Pre-fail offline 0 100 1 100 - 100% OK 241 Total LBAs Written Life-span online 8,099,325,514 (4.1 TB) 100 0 100 - 100% OK 242 Total LBAs Read Life-span online 1,655,605,942 (847.7 GB) 100 0 100 - 100% OK === DRIVE ERROR LOG === error log is empty === DRIVE SELF-TEST LOG === self-test log is empty === DEVICE STATISTICS === [0x01] General Statistics (revision 3) 0x08 Lifetime Power-on Resets : 1,089 0x10 Power-on Hours : 108 hours 0x18 Logical Sectors Written : 8,099,325,514 (4.1 TB) 0x20 Number of Write Commands : 19,478,258 0x28 Logical Sectors Read : 1,655,605,942 (847.7 GB) 0x30 Number of Read Commands : 28,338,076 0x38 Date and Time TimeStamp : 388,800,000 ms 0x40 Pending Error Count : 0 [0x02] Free Fall Statistics (revision 1) 0x10 Overlimit Shock Events : 0 [0x03] Rotating Media Statistics (revision 1) 0x08 Spindle Motor Power-on Hours : 108 hours 0x10 Head Flying Hours : 108 hours 0x18 Head Loaded Events : 1,103 0x20 Reallocated Logical Sector Count : 0 (0 B) 0x28 Read Recovery Attempts : 8 0x30 Mechanical Start Failure Count : 0 0x38 Reallocation Candidate Logical Sector Count: 0 0x40 High Priority Unload Event Count : 30 [0x04] General Errors Statistics (revision 1) 0x08 Number of Reported Uncorrectable Errors : 0 0x10 Resets Between Cmd Accept. and Compl. : 0 [0x05] Temperature Statistics (revision 1) 0x08 Current Temperature : 24 °C 0x10 Average Short Term Temperature : 36 °C 0x20 Highest Temperature : 47 °C 0x28 Lowest Temperature : 16 °C 0x30 Highest Avg. Short Term Temperature : 37 °C 0x38 Lowest Avg. Short Term Temperature : 30 °C 0x50 Time in Over-Temperature : 0 minutes 0x58 Specified Max Operating Temperature : 60 °C 0x60 Time in Under-Temperature : 0 minutes 0x68 Specified Min Operating Temperature : 5 °C [0x06] Transport Statistics (revision 1) 0x08 Number of Hardware Resets : 1,171 0x10 Number of ASR Events : 2 0x18 Number of Interface CRC Errors : 0

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Answer 14

Kkilg Author

Level 1

4 points

Apr 4, 2025 6:04 PM in response to rkaufmann87

Will do. Updated report from DriveDx post reboot

DriveDx SSD

### SYSTEM INFORMATION ### Report Timestamp : April 4, 2025 8:49:51 PM EDT Report Timestamp (ISO 8601 format) : 2025-04-04T20:49:51 Application Name : DriveDx Application Version : 1.12.1.760 Application SubBuild : 0 Application Edition : Standalone Application Website : https://binaryfruit.com/drivedx DriveDx Knowledge Base Revision : 103/103 Computer Name : Keith’s iMac (2) Host Name : Keiths-iMac Computer Model : iMac19,1 OS Boot Time : 2025-04-04T20:41:53 Time Since Boot : 00h 07m 58s OS Name : macOS OS Version : 15.3.2 OS Build : 24D81 OS Kernel Version : Darwin 24.3.0 SAT SMART Driver Version : N/A ATA Command Support Tolerance : verypermissive N of drives in report : 1 ### DRIVE 1 OF 1 ### Last Checked : April 4, 2025 8:48:36 PM EDT Last Checked (ISO 8601 format) : 2025-04-04T20:48:36 Advanced SMART Status : OK Overall Health Rating : GOOD 100% SSD Lifetime Left Indicator : BAD 0% Issues found : 2 Serial Number : S4E2NY0M300930 WWN Id : Volumes : Device Path : /dev/disk1 Total Capacity : 1.1 GB (1,073,741,824 Bytes) Model Family : Apple/Samsung NVMe L-series SSD Model : APPLE SSD SM0128L Firmware Version : ERRORMOD Drive Type : SSD Power On Time : 11,550 hours (16 months 1 days 6 hours) Power Cycles Count : 1,075 Current Power Cycle Time : 0.1 hours === DEVICE CAPABILITIES === S.M.A.R.T. support enabled : yes DriveDx Active Diagnostic Config : Apple/Samsung NVMe SSD L-series config [ssd.nvme.apple.sm.l] Sector Logical Size : 4096 Sector Physical Size : 4096 Physical Interconnect : PCI-Express (PCIe) Logical Protocol : NVM-Express (NVMe) Removable : no Ejectable : no NVMe Revision Supported : 1.10 PCI Vendor Id : 0x144d Thermal Throttling Supported : no Volatile Write Cache Supported : yes Maximum Data Transfer Size : 256 Pages Log Page Attributes : 0x0 Format NVM Attributes : 0x3 Optional Admin Command Support : 0x0 Optional NVM Command Support : 0x1f (Compare, Wr_Unc, DS_Mngmt, Wr_Zero, Save/Sel_Feat) Number of Power States Supported : 2 Error Log Page Entries : 63 Keep Alive Support : 0 Total NVMe Capacity : - Unallocated NVMe Capacity : - Number of NVMe Namespaces : 1 I/O Path : IOService:/AppleACPIPlatformExpert/PCI0@0/AppleACPIPCI/RP17@1B/IOPP/SSD0@0/IONVMeController/IONVMeBlockStorageDevice@1 [Known device ]: yes [Drive State Flags ]: 0x20000280 [Last State Change Timestamp ]: 2025-04-04T20:48:36 [Last State Change Flags ]: 0x20000280 [Last State Change Diff Flags ]: 0x1 Last Email Report Timestamp : 2025-04-04T20:48:36 Last Email Report Reason Flags : 0x20000280 Last Email Report State Change Flags : 0x1 === CURRENT POWER CYCLE STATISTICS === Time since computer startup : 0 hours Data Read : 0 bytes (0 B) Data Written : 0 bytes (0 B) Data Read/hour : 0 B/hour Data Write/hour : 0 B/hour Operations (Read) : 48 Read IOPS : 944 Operations (Write) : 18 Write IOPS : 354 Operations Read/Write Ratio : 3 Throughput per operation (Read) : 0 B/Op Throughput per operation (Write) : 0 B/Op Latency Time (Read) : 0 ns Latency Time (Write) : 0 ns Retries (Read) : 0 Retries (Write) : 0 Errors (Read) : 48 Errors (Write) : 18 === PROBLEMS SUMMARY === Failed Indicators (life-span / pre-fail) : 0 (0 / 0) Failing Indicators (life-span / pre-fail) : 0 (0 / 0) Warnings (life-span / pre-fail) : 1 (0 / 1) I/O Error Count : 66 (48 / 18) === IMPORTANT HEALTH INDICATORS === ID NAME RAW VALUE STATUS 7 Data Units Written 404,551,440 (207.1 TB) 100% OK 14 Media and Data Integrity Errors 183 100% Warning === TEMPERATURE INFORMATION (CELSIUS) === Current Temperature : 4.29497e+09 Power Cycle Min Temperature : 4.29497e+09 Power Cycle Max Temperature : 4.29497e+09 Lifetime Min Temperature : 4.29497e+09 Lifetime Max Temperature : 4.29497e+09 Recommended Min Temperature : 5 Recommended Max Temperature : 65 Temperature Min Limit : 5 Temperature Max Limit : 70 === DRIVE HEALTH INDICATORS === ID | NAME | TYPE | UPDATE | RAW VALUE | VALUE | THRESHOLD | WORST | LAST MODIFIED | STATUS 2 Composite Temperature Life-span online 0xFFFFFEEF (4,294,967,023 °C) 373 0 373 4/4/25 8:48 PM 100% OK 3 Available Spare Pre-fail online 0 0 10 0 4/4/25 8:48 PM 100% OK 5 Life Percentage Used Life-span online 255 0 0 0 4/4/25 8:48 PM 100% OK 6 Data Units Read Life-span online 686,755,717 (351.6 TB) 100 0 100 4/4/25 8:48 PM 100% OK 7 Data Units Written Life-span online 404,551,440 (207.1 TB) 100 0 100 4/4/25 8:48 PM 100% OK 8 Host Read Commands Life-span online 40,006,908,517 100 0 100 4/4/25 8:48 PM 100% OK 9 Host Write Commands Life-span online 9,622,963,314 100 0 100 4/4/25 8:48 PM 100% OK 10 Controller Busy Time Life-span online 59,471 (59,471 minutes) 100 0 100 4/4/25 8:48 PM 100% OK 11 Power Cycles Life-span online 1,075 100 0 100 4/4/25 8:48 PM 100% OK 12 Power On Hours Life-span online 11,550 (11,550 hours) 100 0 100 4/4/25 8:48 PM 100% OK 13 Unsafe Shutdowns Life-span online 285 100 0 100 4/4/25 8:48 PM 100% OK 14 Media and Data Integrity Errors Pre-fail online 183 100 0 100 4/4/25 8:48 PM 100% Warning 15 Error Information Log Entries Pre-fail online 0 100 0 100 4/4/25 8:48 PM 100% OK 16 Warning Composite Temperature Time Life-span online 0 (0 minutes) 100 0 100 4/4/25 8:48 PM 100% OK 17 Critical Composite Temperature Time Life-span online 0 (0 minutes) 100 0 100 4/4/25 8:48 PM 100% OK === DRIVE ERROR LOG === error log is empty

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Answer 15

Kkilg Author

Level 1

4 points

Apr 4, 2025 6:07 PM in response to rkaufmann87

Post reboot DeiveDx

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Desperately need help restoring fusion drive on a 2019 iMac.