linux-kernel - Re: [BUG] Linux-2.6.31-rc1 Fails To Recognize Some USB Disks

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Date:	Mon, 29 Jun 2009 11:17:48 +0300
From:	Tarkan Erimer <tarkan.erimer@...knet.net.tr>
To:	"Martin K. Petersen" <martin.petersen@...cle.com>
CC:	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	Matthew Wilcox <matthew@....cx>
Subject: Re: [BUG] Linux-2.6.31-rc1 Fails To Recognize Some USB Disks

On 06/29/2009 06:21 AM, Martin K. Petersen wrote:
> Can you please mail us the output of...
>
> # sg_inq /dev/sdb
> # sg_readcap /dev/sdb
> # sg_readcap -l /dev/sdb
>
> ... for that WD drive?
>
> You may have to install the sg3_utils package.
>
>    

Here are the outputs of sg_* commands. But, I faced a strange behavior 
when I was trying these sg_* commands. Initially, it didn't recognize my 
usb WD disk as I mentioned in my BUG report. Then, after 8 mins, it 
recognized (you can see it on attached "usb.log" file.) it! so, I was 
able to get the outputs of sg_* commands ( Because; when it didn't 
recognize it, there was no "sdb" file under /dev ) and now it works fine!

root@...kane:~# sg_inq /dev/sdb
standard INQUIRY:
   PQual=0  Device_type=0  RMB=0  version=0x00  [no conformance claimed]
   [AERC=0]  [TrmTsk=0]  NormACA=0  HiSUP=0  Resp_data_format=0
   SCCS=0  ACC=0  TGPS=0  3PC=0  Protect=0  BQue=0
   EncServ=0  MultiP=0  [MChngr=0]  [ACKREQQ=0]  Addr16=0
   [RelAdr=0]  WBus16=0  Sync=0  Linked=0  [TranDis=0]  CmdQue=0
   [SPI: Clocking=0x0  QAS=0  IUS=0]
     length=74 (0x4a)   Peripheral device type: disk
  Vendor identification: WD
  Product identification: 2500JB External
  Product revision level: 0108

root@...kane:~# sg_readcap /dev/sdb
Read Capacity results:
    Last logical block address=488397167 (0x1d1c596f), Number of 
blocks=488397168
    Logical block length=512 bytes
Hence:
    Device size: 250059350016 bytes, 238475.2 MiB, 250.06 GB


root@...kane:~# sg_readcap -l /dev/sdb
READ CAPACITY (16) failed [res=-1], try with '-v'


Tarkan


View attachment "usb.log" of type "text/plain" (3936 bytes)