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Globalksp Author

Level 1

23 points

Samsung 850 EVO Consistent Corruption on Mid-2012 MBP

Stats are below.

My Samsung 850 EVO 250GB is my OS drive on my Mid-2012 MBP. It seems that every time I run disk utility, the drive is corrupt and needs to be repaired via booting in recovery mode.

How do I troubleshoot what is causing the corruption (from the Disk Utility First Aid dialog box it appears that there is an incorrect block count)?

Thanks.

Hardware Overview:

Model Name: MacBook Pro

Model Identifier: MacBookPro9,1

Processor Name: Intel Core i7

Processor Speed: 2.6 GHz

Number of Processors: 1

Total Number of Cores: 4

L2 Cache (per Core): 256 KB

L3 Cache: 6 MB

Memory: 16 GB

Boot ROM Version: 226.0.0.0.0

SMC Version (system): 2.1f175

Hardware UUID: 201BAD24-CB45-5878-9410-5506BBB224B3

Intel 7 Series Chipset:

Vendor: Intel

Product: 7 Series Chipset

Link Speed: 6 Gigabit

Negotiated Link Speed: 6 Gigabit

Physical Interconnect: SATA

Description: AHCI Version 1.30 Supported

Samsung SSD 850 EVO 250GB:

Capacity: 250.06 GB (250,059,350,016 bytes)

Model: Samsung SSD 850 EVO 250GB

Revision: EMT02B6Q

Serial Number: S21NNXAG912791D

Native Command Queuing: Yes

Queue Depth: 32

Removable Media: No

Detachable Drive: No

BSD Name: disk0

Medium Type: Solid State

TRIM Support: No

Partition Map Type: GPT (GUID Partition Table)

S.M.A.R.T. status: Verified

Volumes:

EFI:

Capacity: 209.7 MB (209,715,200 bytes)

File System: MS-DOS FAT32

BSD Name: disk0s1

Content: EFI

Volume UUID: 85D67001-D93E-3687-A1C2-79D677F0C2E0

disk0s2:

Capacity: 249.2 GB (249,199,591,424 bytes)

BSD Name: disk0s2

Content: Apple_CoreStorage

Recovery HD:

Capacity: 650 MB (650,002,432 bytes)

File System: Journaled HFS+

BSD Name: disk0s3

Content: Apple_Boot

Volume UUID: D31CB82D-87DB-3070-949F-1AD0A6656F98

MacBook Pro

Posted on Jul 26, 2019 12:22 PM

Best reply

babowa

Level 9

78,097 points

Posted on Jul 26, 2019 1:13 PM

Just google for some conversations on the Samsung; here is one - an older thread, but incompatibility was evident then:

https://discussions.apple.com/thread/7400926#29552086022

I would go to OWC (macsales.com) for SSDs that are guaranteed to work with Macs; I have one in my mid 2012 MBP and it has been a flawless performance for more than 2 years now. I would not trust anyone else, especially when they are cheap - you get what you pay for.

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Best reply

babowa

Level 9

78,097 points

Jul 26, 2019 1:13 PM in response to Globalksp

Just google for some conversations on the Samsung; here is one - an older thread, but incompatibility was evident then:

https://discussions.apple.com/thread/7400926#29552086022

y_p_w

Level 6

17,642 points

Jul 26, 2019 1:03 PM in response to Globalksp

Depends on why it's corrupted. I've worked in the SSD industry, and one of the things that could cause nasty issues is if the wear leveling database is corrupted. There's a tendency to write in the same locations over and over again, which isn't that great for NAND flash. So these addresses turn into virtual locations that are moved around the memory with lookup tables to indicate where to map blocks to the physical memory. On top of that, NAND flash memory is inherently unreliable. That's not to say that one shouldn't trust it, but as the cells wear out from being erased, they need to employ more and more error correction. The error correction is built into the system, and when it's needed it will slow down read operations.

At the current prices I think it might be worthwhile to just get a new SSD. I just bought a WD Blue 3D NAND 1 TB for $115 plus tax. A 500-512 GB SanDisk or WD Blue is maybe $50-70 these days. These are some of the more advanced types with 3D NAND that has higher endurance than most TLC NAND, along with a buffer that uses single level cell NAND on the front end as almost a cache.

Jul 26, 2019 12:27 PM in response to Globalksp

I believe the 850 is known to have issues on Mac.

Samsung 850 EVO Consistent Corruption on Mid-2012 MBP