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Yesterday, while I was working on several files stored in my USB, suddenly, it was not recognized by the system. It is shown at Disk Utility as 'Generic USB Mass Storage', but I cannot format it. Gparted doesn't show it. I have been reading forum a day and a half. Even I have try it in Windows, but I cannot format it (one of the apps I installed to recover data, identified the RAW filesystem on my USB). I don't know what more can I do.

If it would be possible, I would like to recover all the files form my USB but I know it will be difficult.

In order to describe the problem, I show you the results I get with some commands:

ls /dev/sd

#my usb is /dev/sdb*
/dev/sda /dev/sda3 /dev/sda5 /dev/sda7 /dev/sdb
/dev/sda2 /dev/sda4 /dev/sda6 /dev/sda8 /dev/sdc

sudo fdisk /dev/sdb
fdisk: unable to read /dev/sdb: Invalid argument

ls -al /dev/sdb
brw-rw---- 1 root disk 8, 16 abe 27 17:34 /dev/sdb

dmesg | grep sdb

*#this is not the full text I get from dmesg, but I think READ CAPACITY FAILED y UNABLED TO READ SUPERBLOCK are the most important parts of it*

[ 51.274309] sd 4:0:0:0: [sdb] READ CAPACITY failed
[ 51.274314] sd 4:0:0:0: [sdb] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 51.274321] sd 4:0:0:0: [sdb] Sense Key : Unit Attention [current]
[ 51.274328] sd 4:0:0:0: [sdb] Add. Sense: Not ready to ready change, medium may have changed
[ 51.274836] sd 4:0:0:0: [sdb] Write Protect is off
[ 51.274843] sd 4:0:0:0: [sdb] Mode Sense: 45 00 00 00
[ 51.275491] sd 4:0:0:0: [sdb] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
[ 51.279727] sd 4:0:0:0: [sdb] READ CAPACITY failed
[ 51.279733] sd 4:0:0:0: [sdb] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 51.279739] sd 4:0:0:0: [sdb] Sense Key : Unit Attention [current]
[ 51.279745] sd 4:0:0:0: [sdb] Add. Sense: Not ready to ready change, medium may have changed
[ 51.281542] sd 4:0:0:0: [sdb] Attached SCSI removable disk
[ 1156.511131] sd 4:0:0:0: [sdb] READ CAPACITY failed
[ 1156.511137] sd 4:0:0:0: [sdb] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 1156.511141] sd 4:0:0:0: [sdb] Sense Key : Unit Attention [current]
[ 1156.511146] sd 4:0:0:0: [sdb] Add. Sense: Not ready to ready change, medium may have changed
[ 2805.807311] EXT4-fs (sdb): unable to read superblock
[ 2940.783288] FAT-fs (sdb): unable to read boot sector
[ 3560.267178] FAT-fs (sdb): unable to read boot sector
[ 3745.235833] FAT-fs (sdb): unable to read boot sector

could anyone help me? thanks a lot.

Henry.

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