I'm having some fun and games with a new SSD connected to a Pi via USB.
This has happened two days running, I've tried re-partitioning and
re-formating the disk, but to no avail.

I've got the disc partitioned and formatted (ext4), and then I mount it.
So far so good.  After about 4 hours of copying data to it from an
existing HDD (which it is intended to replace), I get a series of
messages informing me that the disc is read only.

e2fsck informs me :

e2fsck: No such file or directory while trying to open /dev/sdb1
possible non-existent device?

I've also seen it suggest :

Attempt to read block from filesystem resulted in short read whilst
trying to open /dev/sdb1
could this be a zero-length partition?

If I connect the disc to my Ubuntu box, all seems well, it mounts and I
can read/write to it.

On top of this, when I try to remount it, mount -a doesn't give any
errors, but the mount disappears almost immediately, as does the mount
point (/media/extdisc2)

 From /var/log/messages :

Jul 17 14:33:35 ffoilpi1 kernel: [79524.954860] usb 1-1.2: reset
high-speed USB device number 7 using dwc_otg
Jul 17 14:33:36 ffoilpi1 kernel: [79525.937346] sd 1:0:0:0: [sdb]
UNKNOWN(0x2003) Result: hostbyte=0x00 driverbyte=0x08
Jul 17 14:33:36 ffoilpi1 kernel: [79525.937389] sd 1:0:0:0: [sdb] Sense
Key : 0x2 [current]
Jul 17 14:33:36 ffoilpi1 kernel: [79525.937469] sd 1:0:0:0: [sdb]
ASC=0x3a ASCQ=0x0
Jul 17 14:33:36 ffoilpi1 kernel: [79525.937500] sd 1:0:0:0: [sdb] CDB:
opcode=0x2a 2a 00 4f 84 7b 70 00 00 10 00
Jul 17 14:33:36 ffoilpi1 kernel: [79525.937557] EXT4-fs warning (device
sdb1): ext4_end_bio:332: I/O error -5 writing to inode 41683705 (offset
0 size 8192 starting block 166760304)
Jul 17 14:33:36 ffoilpi1 kernel: [79525.939007] sd 1:0:0:0: [sdb]
UNKNOWN(0x2003) Result: hostbyte=0x00 driverbyte=0x08
Jul 17 14:33:36 ffoilpi1 kernel: [79525.939051] sd 1:0:0:0: [sdb] Sense
Key : 0x2 [current]
Jul 17 14:33:36 ffoilpi1 kernel: [79525.939079] sd 1:0:0:0: [sdb]
ASC=0x3a ASCQ=0x0
Jul 17 14:33:36 ffoilpi1 kernel: [79525.939108] sd 1:0:0:0: [sdb] CDB:
opcode=0x28 28 00 4c c0 08 08 00 00 08 00
Jul 17 14:33:36 ffoilpi1 kernel: [79525.956440] sd 1:0:0:0: [sdb]
UNKNOWN(0x2003) Result: hostbyte=0x00 driverbyte=0x08
Jul 17 14:33:36 ffoilpi1 kernel: [79525.956486] sd 1:0:0:0: [sdb] Sense
Key : 0x2 [current]
Jul 17 14:33:36 ffoilpi1 kernel: [79525.956513] sd 1:0:0:0: [sdb]
ASC=0x3a ASCQ=0x0
Jul 17 14:33:36 ffoilpi1 kernel: [79525.956542] sd 1:0:0:0: [sdb] CDB:
opcode=0x28 28 00 4f c0 08 00 00 00 08 00
Jul 17 14:33:36 ffoilpi1 kernel: [79525.975711] sd 1:0:0:0: [sdb]
UNKNOWN(0x2003) Result: hostbyte=0x00 driverbyte=0x08
Jul 17 14:33:36 ffoilpi1 kernel: [79525.975761] sd 1:0:0:0: [sdb] Sense
Key : 0x2 [current]
Jul 17 14:33:36 ffoilpi1 kernel: [79525.975789] sd 1:0:0:0: [sdb]
ASC=0x3a ASCQ=0x0
Jul 17 14:33:36 ffoilpi1 kernel: [79525.975817] sd 1:0:0:0: [sdb] CDB:
opcode=0x2a 2a 00 4f 84 7c 58 00 00 d8 00
Jul 17 14:33:36 ffoilpi1 kernel: [79525.975870] EXT4-fs warning (device
sdb1): ext4_end_bio:332: I/O error -5 writing to inode 41683706 (offset
0 size 12288 starting block 166760334)
Jul 17 14:33:36 ffoilpi1 kernel: [79525.975988] EXT4-fs warning (device
sdb1): ext4_end_bio:332: I/O error -5 writing to inode 41683707 (offset
0 size 8192 starting block 166760336)
Jul 17 14:33:36 ffoilpi1 kernel: [79525.976067] EXT4-fs warning (device
sdb1): ext4_end_bio:332: I/O error -5 writing to inode 41683708 (offset
0 size 16384 starting block 166760340)
Jul 17 14:33:36 ffoilpi1 kernel: [79525.976162] EXT4-fs warning (device
sdb1): ext4_end_bio:332: I/O error -5 writing to inode 41683709 (offset
0 size 8192 starting block 166760342)
Jul 17 14:33:36 ffoilpi1 kernel: [79525.976200] EXT4-fs warning (device
sdb1): ext4_end_bio:332: I/O error -5 writing to inode 41683711 (offset
0 size 12288 starting block 166760345)
Jul 17 14:33:36 ffoilpi1 kernel: [79525.976241] EXT4-fs warning (device
sdb1): ext4_end_bio:332: I/O error -5 writing to inode 41683724 (offset
0 size 4096 starting block 166760346)
Jul 17 14:33:36 ffoilpi1 kernel: [79525.976279] EXT4-fs warning (device
sdb1): ext4_end_bio:332: I/O error -5 writing to inode 41683712 (offset
0 size 8192 starting block 166760348)
Jul 17 14:33:36 ffoilpi1 kernel: [79525.976316] EXT4-fs warning (device
sdb1): ext4_end_bio:332: I/O error -5 writing to inode 41683713 (offset
0 size 8192 starting block 166760350)
Jul 17 14:33:36 ffoilpi1 kernel: [79525.976353] EXT4-fs warning (device
sdb1): ext4_end_bio:332: I/O error -5 writing to inode 41683714 (offset
0 size 8192 starting block 166760352)
Jul 17 14:33:36 ffoilpi1 kernel: [79525.978324] sd 1:0:0:0: [sdb]
UNKNOWN(0x2003) Result: hostbyte=0x00 driverbyte=0x08
Jul 17 14:33:36 ffoilpi1 kernel: [79525.978368] sd 1:0:0:0: [sdb] Sense
Key : 0x2 [current]
Jul 17 14:33:36 ffoilpi1 kernel: [79525.978432] sd 1:0:0:0: [sdb]
ASC=0x3a ASCQ=0x0
Jul 17 14:33:36 ffoilpi1 kernel: [79525.978467] sd 1:0:0:0: [sdb] CDB:
opcode=0x2a 2a 00 4f 84 7d 30 00 00 28 00
Jul 17 14:33:36 ffoilpi1 kernel: [79525.983726] sd 1:0:0:0: [sdb]
UNKNOWN(0x2003) Result: hostbyte=0x00 driverbyte=0x08
Jul 17 14:33:36 ffoilpi1 kernel: [79525.983779] sd 1:0:0:0: [sdb] Sense
Key : 0x2 [current]
Jul 17 14:33:36 ffoilpi1 kernel: [79525.983804] sd 1:0:0:0: [sdb]
ASC=0x3a ASCQ=0x0
Jul 17 14:33:36 ffoilpi1 kernel: [79525.983833] sd 1:0:0:0: [sdb] CDB:
opcode=0x2a 2a 00 4f 84 7d 58 00 00 d8 00
Jul 17 14:33:36 ffoilpi1 kernel: [79525.988628] sd 1:0:0:0: [sdb]
UNKNOWN(0x2003) Result: hostbyte=0x00 driverbyte=0x08
Jul 17 14:33:36 ffoilpi1 kernel: [79525.988680] sd 1:0:0:0: [sdb] Sense
Key : 0x2 [current]
Jul 17 14:33:36 ffoilpi1 kernel: [79525.988705] sd 1:0:0:0: [sdb]
ASC=0x3a ASCQ=0x0
Jul 17 14:33:36 ffoilpi1 kernel: [79525.988734] sd 1:0:0:0: [sdb] CDB:
opcode=0x2a 2a 00 4f 84 7e 30 00 00 c0 00
Jul 17 14:33:36 ffoilpi1 kernel: [79525.992751] sd 1:0:0:0: [sdb]
UNKNOWN(0x2003) Result: hostbyte=0x00 driverbyte=0x08
Jul 17 14:33:36 ffoilpi1 kernel: [79525.992807] sd 1:0:0:0: [sdb] Sense
Key : 0x2 [current]
Jul 17 14:33:36 ffoilpi1 kernel: [79525.992833] sd 1:0:0:0: [sdb]
ASC=0x3a ASCQ=0x0
Jul 17 14:33:36 ffoilpi1 kernel: [79525.992861] sd 1:0:0:0: [sdb] CDB:
opcode=0x2a 2a 00 4f 84 7e f0 00 00 a0 00
Jul 17 14:33:36 ffoilpi1 kernel: [79525.997471] sd 1:0:0:0: [sdb]
UNKNOWN(0x2003) Result: hostbyte=0x00 driverbyte=0x08
Jul 17 14:33:36 ffoilpi1 kernel: [79525.997521] sd 1:0:0:0: [sdb] Sense
Key : 0x2 [current]
Jul 17 14:33:36 ffoilpi1 kernel: [79525.997546] sd 1:0:0:0: [sdb]
ASC=0x3a ASCQ=0x0
Jul 17 14:33:36 ffoilpi1 kernel: [79525.997575] sd 1:0:0:0: [sdb] CDB:
opcode=0x2a 2a 00 4f 84 7f 90 00 00 b0 00
Jul 17 14:33:36 ffoilpi1 kernel: [79526.003355] sd 1:0:0:0: [sdb]
UNKNOWN(0x2003) Result: hostbyte=0x00 driverbyte=0x08
Jul 17 14:33:36 ffoilpi1 kernel: [79526.003456] sd 1:0:0:0: [sdb] Sense
Key : 0x2 [current]
Jul 17 14:33:36 ffoilpi1 kernel: [79526.003489] sd 1:0:0:0: [sdb]
ASC=0x3a ASCQ=0x0
Jul 17 14:33:36 ffoilpi1 kernel: [79526.003525] sd 1:0:0:0: [sdb] CDB:
opcode=0x2a 2a 00 4f 84 80 40 00 00 f0 00

and later when trying to remount :

Jul 17 14:51:32 ffoilpi1 kernel: [80601.579571] usb 1-1.2: new high-speed USB
device number 11 using dwc_otg
Jul 17 14:51:32 ffoilpi1 kernel: [80601.722233] usb 1-1.2: New USB device
found, idVendor=174c, idProduct=1153
Jul 17 14:51:32 ffoilpi1 kernel: [80601.722275] usb 1-1.2: New USB device
strings: Mfr=2, Product=3, SerialNumber=1
Jul 17 14:51:32 ffoilpi1 kernel: [80601.722298] usb 1-1.2: Product: AS2115
Jul 17 14:51:32 ffoilpi1 kernel: [80601.722316] usb 1-1.2: Manufacturer:
ASMedia
Jul 17 14:51:32 ffoilpi1 kernel: [80601.722334] usb 1-1.2: SerialNumber:
00000000000000000000
Jul 17 14:51:32 ffoilpi1 kernel: [80601.733269] usb-storage 1-1.2:1.0: USB Mass
Storage device detected
Jul 17 14:51:32 ffoilpi1 kernel: [80601.737779] scsi host5: usb-storage
1-1.2:1.0
Jul 17 14:51:33 ffoilpi1 kernel: [80602.730921] scsi 5:0:0:0: Direct-Access
ASMT     2115             0    PQ: 0 ANSI: 6
Jul 17 14:51:33 ffoilpi1 kernel: [80602.737024] sd 5:0:0:0: Attached scsi
generic sg1 type 0
Jul 17 14:51:33 ffoilpi1 kernel: [80602.738539] sd 5:0:0:0: [sdb] Spinning up
disk...
Jul 17 14:51:36 ffoilpi1 kernel: [80603.739558] ...ready
Jul 17 14:51:36 ffoilpi1 kernel: [80605.760942] sd 5:0:0:0: [sdb] 1953525168
512-byte logical blocks: (1.00 TB/932 GiB)
Jul 17 14:51:36 ffoilpi1 kernel: [80605.761829] sd 5:0:0:0: [sdb] Write Protect
is off
Jul 17 14:51:36 ffoilpi1 kernel: [80605.762849] sd 5:0:0:0: [sdb] Write cache:
enabled, read cache: enabled, doesn't support DPO or FUA
Jul 17 14:51:36 ffoilpi1 kernel: [80605.773417]  sdb: sdb1
Jul 17 14:51:36 ffoilpi1 kernel: [80605.778197] sd 5:0:0:0: [sdb] Attached SCSI
disk
Jul 17 14:52:42 ffoilpi1 kernel: [80671.935409] EXT4-fs (sdb1): recovery
complete
Jul 17 14:52:42 ffoilpi1 kernel: [80671.935511] EXT4-fs (sdb1): mounted
filesystem with ordered data mode. Opts: (null)
Jul 17 14:52:50 ffoilpi1 kernel: [80679.691859] usb 1-1.2: USB disconnect,
device number 11
Jul 17 14:52:50 ffoilpi1 kernel: [80679.702064] sd 5:0:0:0: [sdb] Synchronizing
SCSI cache
Jul 17 14:52:50 ffoilpi1 kernel: [80679.702399] sd 5:0:0:0: [sdb] Synchronize
Cache(10) failed: Result: hostbyte=0x01 driverbyte=0x00
Jul 17 14:53:59 ffoilpi1 kernel: [80748.540252] usb 1-1.2: new high-speed USB
device number 12 using dwc_otg
Jul 17 14:53:59 ffoilpi1 kernel: [80748.682866] usb 1-1.2: New USB device
found, idVendor=174c, idProduct=1153
Jul 17 14:53:59 ffoilpi1 kernel: [80748.682914] usb 1-1.2: New USB device
strings: Mfr=2, Product=3, SerialNumber=1
Jul 17 14:53:59 ffoilpi1 kernel: [80748.682934] usb 1-1.2: Product: AS2115
Jul 17 14:53:59 ffoilpi1 kernel: [80748.682954] usb 1-1.2: Manufacturer:
ASMedia
Jul 17 14:53:59 ffoilpi1 kernel: [80748.682971] usb 1-1.2: SerialNumber:
00000000000000000000
Jul 17 14:53:59 ffoilpi1 kernel: [80748.692859] usb-storage 1-1.2:1.0: USB Mass
Storage device detected
Jul 17 14:53:59 ffoilpi1 kernel: [80748.698511] scsi host6: usb-storage
1-1.2:1.0
Jul 17 14:54:00 ffoilpi1 kernel: [80749.691474] scsi 6:0:0:0: Direct-Access
ASMT     2115             0    PQ: 0 ANSI: 6
Jul 17 14:54:00 ffoilpi1 kernel: [80749.698196] sd 6:0:0:0: [sdb] Spinning up
disk...
Jul 17 14:54:00 ffoilpi1 kernel: [80749.701856] sd 6:0:0:0: Attached scsi
generic sg1 type 0
Jul 17 14:54:02 ffoilpi1 kernel: [80750.700268] .
Jul 17 14:54:03 ffoilpi1 kernel: [80752.720217] .ready
Jul 17 14:54:03 ffoilpi1 kernel: [80752.721631] sd 6:0:0:0: [sdb] 1953525168
512-byte logical blocks: (1.00 TB/932 GiB)
Jul 17 14:54:03 ffoilpi1 kernel: [80752.722572] sd 6:0:0:0: [sdb] Write Protect
is off
Jul 17 14:54:03 ffoilpi1 kernel: [80752.723506] sd 6:0:0:0: [sdb] Write cache:
enabled, read cache: enabled, doesn't support DPO or FUA
Jul 17 14:54:03 ffoilpi1 kernel: [80752.734373]  sdb: sdb1
Jul 17 14:54:03 ffoilpi1 kernel: [80752.738920] sd 6:0:0:0: [sdb] Attached SCSI
disk
Jul 17 14:54:54 ffoilpi1 kernel: [80804.218369] EXT4-fs (sdb1): recovery
complete
Jul 17 14:54:54 ffoilpi1 kernel: [80804.218429] EXT4-fs (sdb1): mounted
filesystem with ordered data mode. Opts: (null)
Jul 17 14:55:02 ffoilpi1 kernel: [80811.549925] usb 1-1.2: USB disconnect,
device number 12
Jul 17 14:55:02 ffoilpi1 kernel: [80811.557555] sd 6:0:0:0: [sdb] Synchronizing
SCSI cache
Jul 17 14:55:02 ffoilpi1 kernel: [80811.560278] sd 6:0:0:0: [sdb] Synchronize
Cache(10) failed: Result: hostbyte=0x01 driverbyte=0x00

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