can not mount external disk

$ diskutil list

/dev/disk0 (internal):

/dev/disk2 (external, physical):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *1.0 TB disk2

1: EFI EFI 209.7 MB disk2s1

2: Apple_HFS SSD 1TB 1.0 TB disk2s2

3: Apple_Boot Recovery HD 650.0 MB disk2s3

$ mount /dev/Disk2s2

mount: /dev/Disk2s2: unknown special file or file system.

$ diskutil verifyVolume /dev/disk2s2

Started file system verification on disk2s2 SSD 1TB

Verifying file system

Volume is already unmounted

Performing fsck_hfs -fn -x /dev/rdisk2s2

Checking Journaled HFS Plus volume

Checking extents overflow file

Checking catalog file

Checking multi-linked files

Checking catalog hierarchy

Checking extended attributes file

Checking multi-linked directories

Checking volume bitmap

Checking volume information

The volume SSD 1TB appears to be OK

File system check exit code is 0

Restoring the original state found as unmounted

Hi

Was able to "unmount" the drive:

One or more volume(s) failed to mount

$ diskutil unmountDisk /dev/disk2s2

Unmount of all volumes on disk2 was successful

$ diskutil mountDisk /dev/disk2s2

One or more volume(s) failed to mount

$ diskutil mountforceDisk /dev/disk2s2

diskutil: did not recognize verb "mountforceDisk"; type "diskutil" for a list

my syntax is off on "mount force" apparently the list of commands has been changed

is there any point in running the "verify" or "repair" functions ??

Thanks !

ps called apple support - zero help there !

:(

could it be that the Samsung SSD driver was corrupted ? Samsung were NOT helpful ! :(

diskutil repairDisk /dev/disk11

Repairing the partition map might erase disk11s1, proceed? (y/N) N

Repair cancelled

rolfs-iMac-4:~ rolf$ diskutil mount /dev/disk11

Unable to find disk for /dev/disk11

Started 3rd party recovery and ran it - it could see the volume with data structure intact - with it running, I re-input

diskutil mountDisk /dev/disk11

Volume(s) mounted successfully

went to DU and tried to run repair - ran successfully

but didn't mount

"Problems were found with the partition map which might prevent booting"

I'm investigating this now

Thank you

Drive failed after apple's "migration assistant" crashed

re your suggestion

“Nov 14, 2020 12:52 PM in response to rolf66

Hmmm, might be the Samsung driver, DU should see it unless the driver is interfering or it has died”

... do you know of any trusted 3rd party apps that would assist in “mounting” the drive ?

thanks for your response

USB External Physical Volume • Mac OS Extended (Journaled)

hi BDAqua

thanks for your reply

the external samsung 1 Tb ssd fails to mount after crash

hi

didn't you imply it needed drivers in your previous post ?

thanks