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  1. Bug #704900
  2. Comment #4

Comment 4 for bug 704900

Revision history for this message
Yann (lostec) wrote : Re: External USB3 disk problems: Sense Key : Recovered Error

I experience the same problem (with up to date 10.04.1 running 2.6.32-31-generic-pae) with a brand new USB key (Super Talent Express Ram Cache 32GB, USB3 used in an USB2 port).

I noticed problems at umount (error messages concerning cache sync and device stop) so I checked dmesg after a automount and:

****

[ 843.688065] usb 1-3: new high speed USB device using ehci_hcd and address 4
[ 843.830750] usb 1-3: configuration #1 chosen from 1 choice
[ 843.831639] scsi3 : SCSI emulation for USB Mass Storage devices
[ 843.832036] usb-storage: device found at 4
[ 843.832041] usb-storage: waiting for device to settle before scanning
[ 848.832311] usb-storage: device scan complete
[ 850.893642] scsi 3:0:0:0: Direct-Access Express RAM Cache 1102 PQ: 0 ANSI: 0
[ 850.894860] sd 3:0:0:0: Attached scsi generic sg2 type 0
[ 850.896370] sd 3:0:0:0: [sdb] 57343999 512-byte logical blocks: (29.3 GB/27.3 GiB)
[ 850.897902] sd 3:0:0:0: [sdb] Write Protect is off
[ 850.897910] sd 3:0:0:0: [sdb] Mode Sense: 23 00 00 00
[ 850.897916] sd 3:0:0:0: [sdb] Assuming drive cache: write through
[ 850.902414] sd 3:0:0:0: [sdb] Assuming drive cache: write through
[ 850.902425] sdb: sdb1
[ 850.909458] sd 3:0:0:0: [sdb] Assuming drive cache: write through
[ 850.909468] sd 3:0:0:0: [sdb] Attached SCSI disk
[ 852.772700] sd 3:0:0:0: [sdb] Sense Key : Recovered Error [current] [descriptor]
[ 852.772713] Descriptor sense data with sense descriptors (in hex):
[ 852.772718] 72 01 04 1d 00 00 00 0a 09 0c 00 00 00 00 00 08
[ 852.772741] 00 00
[ 852.772748] sd 3:0:0:0: [sdb] ASC=0x4 ASCQ=0x1d

****

ASC 0x4 seems to be a hardware error reported by attached device, recovered because sense key 4 (offset 2 in descriptor)... could not find any explication for ASCQ 0x1d in charts availlable online and I'm not a SCSI emulation expert ;o)

So do not assume expired. Let me know asap if some more experiment is needed on my side...

Also, the device seems to be operating nicely (cache WT setup at plug may help for umount problem!) despite of these reported problems that do show up in other distros as well (google on it, you'll find it on Fedora and others).

Regards