rolf66 Author

Level 1

4 points

can not mount external disk

Hi have tried all the usual tricks including terminal " mount /dev/disk2"

comes back with this "mount: /dev/disk2: unknown special file or file system."

this thread was helpful but dead ended

https://discussions.apple.com/thread/4870938?answerId=21453584022#21453584022

Any advice would be appreciated.

Thank you

iMac Pro

Posted on Nov 13, 2020 1:35 PM

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25 replies

BDAqua

Level 10

250,259 points

Nov 14, 2020 2:14 PM in response to rolf66

Hopefully not, but can you point that out for me so I can figure out what was meant?

rolf66 Author

Level 1

4 points

Nov 14, 2020 4:13 PM in response to BDAqua

sorry don’t understand your question

rolf66 Author

Level 1

4 points

Nov 15, 2020 12:43 PM in response to BDAqua

it shows up in DM

just won’t mount

thanks

BDAqua

Level 10

250,259 points

Nov 15, 2020 1:12 PM in response to rolf66

What is DM?

rolf66 Author

Level 1

4 points

Nov 14, 2020 1:31 PM in response to BDAqua

Thanks for your considerations

as you will see earlier in this thread DU sees it and can run a diagnostic check which reports everything is ok.

i even tried mounting from the terminal - to no avail.

samsung tech is no help and i don’t recall installing drivers. i have an identical drive in the second bay of the external inclosure and it reads fine.

ant idea where i might get drivers ? i’ve scoured the net - only to find multiple sites saying macs don’t behave with samsung ssd drives.

thank you for your consideration

rolf66 Author

Level 1

4 points

Nov 15, 2020 3:34 PM in response to BDAqua

Sorry meant DU

Also tried this from terminal

rolfs-iMac-4:~ rolf$ sudo mount -t hfs /dev/disk11 /volumes/ssd

mount_hfs: error on mount(): error = -1.

mount_hfs: Invalid argument

rolfs-iMac-4:~ rolf$ diskutil verifydisk disk11

Started partition map verification on disk11

Checking prerequisites

Checking the partition list

Checking the partition map size

Checking for an EFI system partition

Checking the EFI system partition's size

Checking the EFI system partition's file system

Checking the EFI system partition's folder content

Checking all HFS data partition loader spaces

Checking booter partitions

Checking booter partition disk11s3

Verifying file system

Volume is already unmounted

Performing fsck_hfs -fn -x /dev/rdisk11s3

Checking Journaled HFS Plus volume

Checking extents overflow file

Checking catalog file

Checking multi-linked files

Checking catalog hierarchy

Checking extended attributes file

Checking volume bitmap

Checking volume information

The volume Recovery HD appears to be OK

File system check exit code is 0

Restoring the original state found as unmounted

Checking Core Storage Physical Volume partitions

The partition map appears to be OK

Finished partition map verification on disk11

rolfs-iMac-4:~ rolf$ sudo fsck_HFS /dev/disk11

Password:

** /dev/rdisk11

Executing fsck_hfs (version hfs-407.200.4).

volumeType is 0

0000: 0000 0000 0000 0000 0000 0000 0000 0000 |................|

. . .

01b0: 0000 0000 0000 0000 0000 0000 0000 00fe |................|

01c0: ffff eefe ffff 0100 0000 afd2 3b77 0000 |.............w..|

01d0: 0000 0000 0000 0000 0000 0000 0000 0000 |................|

. . .

01f0: 0000 0000 0000 0000 0000 0000 0000 55aa |..............U.|

rolfs-iMac-4:~ rolf$ sudo sudo mkdir /Volumes/ssd

mkdir: /Volumes/ssd: File exists

rolfs-iMac-4:~ rolf$ sudo mount -t hfs /dev/disk11/Volumes/ssd

usage: mount [-dfruvw] [-o options] [-t external_type] special node

mount [-adfruvw] [-t external_type]

mount [-dfruvw] special | node

rolfs-iMac-4:~ rolf$

rolf66 Author

Level 1

4 points

Nov 15, 2020 4:11 PM in response to BDAqua

Volume type : Physical Device

BSD device node : disk11

Connection : USB

Device tree path : IODeviceTree:/PCI0@0/XHC1@14

Writable : No

Is case-sensitive : No

Volume capacity : 1,024,209,543,168

Available space (Purgeable + Free) : 0

Purgeable space : 0

Free space : 0

Used space : 1,024,209,543,168

Owners enabled : No

Is encrypted : No

Can be verified : No

Can be repaired : No

Bootable : No

Journaled : No

Disk number : 11

Media name : Samsung Samsung SSD 850 PRO 1TB Media

Media type : Generic

Ejectable : Yes

Solid state : No

S.M.A.R.T. status : Not Supported

BDAqua

Level 10

250,259 points

Nov 15, 2020 4:00 PM in response to rolf66

Is that drive HFS+ or APFS in DU?

rolf66 Author

Level 1

4 points

Nov 15, 2020 4:13 PM in response to rolf66

DU says it's HFS plus

Verifying file system

Volume is already unmounted

Performing fsck_hfs -fn -x /dev/rdisk11s3

Checking Journaled HFS Plus volume

& thanks for your help with this !

rolf66 Author

Level 1

4 points

Nov 15, 2020 4:46 PM in response to rolf66

Hi was able to access via lazesoft data Recovery - but can't save files to another hard drive, so the disk still contains all my stuff - just need to get it to open on the desktop

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can not mount external disk