Recovering a failed (SSD) hard drive. Unknown partition type.

[linux guy]

Last week the SSD in my laptop threw errors when I was doing a backup
copy of it.  Only 69 of 70 GB copied using Dolphin disk to disk with
"Auto Skip" enabled when there were errors.   I guess the good part is
that 69 of 70 GB of data copied during the backup and the other good
part is that I store my most essential data on another drive.  So
maybe not much was lost, although the copy was my home directory, so
the data lost has to be of some importance.

You can read about the initial experience in the thread  "File copy
errors on EXT4 SSD but fsck says its clean ????" on this list.

I'd like to take a kick at the cat at restoring the rest of my data
and determining what happened.

I ran the BIOS tools on both the memory (RAM) and the hard drive
itself on the laptop.   Both tools returned no errors, as did all the
other tools that I have run against this drive.  (See previous
thread.)

I am attempting to mount the drive via a USB external drive interface
on another machine.  When I connect the interface, dmesg gives me
this:

 usb 2-1.2: new high speed USB device number 4 using ehci_hcd
[  142.896505] usb 2-1.2: New USB device found, idVendor=152d, idProduct=2338
[  142.896508] usb 2-1.2: New USB device strings: Mfr=1, Product=2,
SerialNumber=5
[  142.896509] usb 2-1.2: Product: USB to ATA/ATAPI Bridge
[  142.896511] usb 2-1.2: Manufacturer: JMicron
[  142.896512] usb 2-1.2: SerialNumber: C609942002B8
[  142.897806] scsi9 : usb-storage 2-1.2:1.0
[  143.897825] scsi 9:0:0:0: Direct-Access     INTEL SS DSA2M160G2GC
  02G9 PQ: 0 ANSI: 2 CCS
[  143.898332] sd 9:0:0:0: Attached scsi generic sg2 type 0
[  143.898919] sd 9:0:0:0: [sdb] 312581808 512-byte logical blocks:
(160 GB/149 GiB)
[  143.899642] sd 9:0:0:0: [sdb] Write Protect is off
[  143.899644] sd 9:0:0:0: [sdb] Mode Sense: 00 38 00 00
[  143.900408] sd 9:0:0:0: [sdb] Asking for cache data failed
[  143.900411] sd 9:0:0:0: [sdb] Assuming drive cache: write through
[  143.902663] sd 9:0:0:0: [sdb] Asking for cache data failed
[  143.902665] sd 9:0:0:0: [sdb] Assuming drive cache: write through
[  143.903904]  sdb: unknown partition table
[  143.906419] sd 9:0:0:0: [sdb] Asking for cache data failed
[  143.906421] sd 9:0:0:0: [sdb] Assuming drive cache: write through
[  143.906423] sd 9:0:0:0: [sdb] Attached SCSI disk

What should I do now ?