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Re: USB flash drive opens read only -- how to fix?

On 10/1/19 4:32 PM, Ken Heard wrote:

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On 2019-10-01 5:33 p.m., Pascal Hambourg wrote:

Le 01/10/2019 à 23:09, Ken Heard a écrit :


- - after unmounting and closing encryption running as root
'wipefs -a -f /dev/sdd' returns 'wipefs: error: /dev/sdd: probing
initialization failed: Read-only file system'.


The USB flash drive is probably physically write-protected. Check
the kernel logs juste after inserting it for confirmation.


Here are the kern.log entries created the most recent time this drive:

Oct  1 19:25:21 SOL kernel: [28463.821015] usb 9-4: new SuperSpeed USB
device number 15 using xhci_hcd
Oct  1 19:25:21 SOL kernel: [28463.844007] usb 9-4: New USB device
found, idVendor=0951, idProduct=1666
Oct  1 19:25:21 SOL kernel: [28463.844010] usb 9-4: New USB device
strings: Mfr=1, Product=2, SerialNumber=3
Oct  1 19:25:21 SOL kernel: [28463.844012] usb 9-4: Product:
DataTraveler 3.0
Oct  1 19:25:21 SOL kernel: [28463.844014] usb 9-4: Manufacturer: Kingst
on
Oct  1 19:25:21 SOL kernel: [28463.844016] usb 9-4: SerialNumber:
000AEB91EC07BD41230C0068
Oct  1 19:25:21 SOL kernel: [28463.845810] usb-storage 9-4:1.0: USB
Mass Storage device detected
Oct  1 19:25:21 SOL kernel: [28463.845973] scsi host9: usb-storage 9-4:1
.0
Oct  1 19:25:23 SOL kernel: [28464.861194] scsi 9:0:0:0: Direct-Access
     Kingston DataTraveler 3.0 PMAP PQ: 0 ANSI: 6
Oct  1 19:25:23 SOL kernel: [28464.861817] sd 9:0:0:0: [sdd] 61226496
512-byte logical blocks: (31.3 GB/29.2 GiB)
Oct  1 19:25:23 SOL kernel: [28464.862088] sd 9:0:0:0: [sdd] Write
Protect is off
Oct  1 19:25:23 SOL kernel: [28464.862090] sd 9:0:0:0: [sdd] Mode
Sense: 45 00 00 00
Oct  1 19:25:23 SOL kernel: [28464.862248] sd 9:0:0:0: Attached scsi
generic sg4 type 0
Oct  1 19:25:23 SOL kernel: [28464.862365] sd 9:0:0:0: [sdd] Write
cache: disabled, read cache: enabled, doesn't support DPO or FUA
Oct  1 19:25:23 SOL kernel: [28465.042599] sd 9:0:0:0: [sdd] Write
Protect is on
Oct  1 19:25:23 SOL kernel: [28465.042604] sd 9:0:0:0: [sdd] Mode
Sense: 45 00 80 00
Oct  1 19:25:23 SOL kernel: [28465.043086] sd 9:0:0:0: [sdd] Attached
SCSI removable disk
Oct  1 19:25:37 SOL kernel: [28479.639563] EXT4-fs (dm-7): mounting
ext2 file system using the ext4 subsystem
Oct  1 19:25:37 SOL kernel: [28479.642175] EXT4-fs (dm-7): mounted
filesystem without journal. Opts: (null)

One entry says that Write protect is off, but a later entry says that
is is on.

How could this drive be physically protected from writing to it when
there is no switch on the drive itself to unable (or release) such
physical protection?

Regards, Ken
I have read that some USB flash drives will revert to read-only mode when they detect an internal error. This gives the user a chance to copy out their data. My limited experience with failing USB flash drives is that they go from read-write to read-only to useless in a matter of minutes or seconds.
What happens if you insert the USB drive into a Windows machine and try to format it (cancel out before doing the actual format)? macOS? FreeBSD? Other? 


David
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