[Bug 264789] Re: USB Hard Drive Not Accessible, vol_id hangs

[earthsound]

Using:

Linux ubuntu 2.6.31-14-generic #48-Ubuntu SMP Fri Oct 16 14:04:26 UTC
2009 i686 GNU/Linux

with the same JMicron Hi-Speed USB to SATA & PATA Combo Bridge as
mentioned in comment #100, I am still hitting this bug. :( I have a
Western Digital Cavier SE16, 640GB SATA drive (WD6400AAKS) attached to
this adapter.

idVendor 0x152d JMicron Technology Corp. / JMicron USA Technology Corp.
idProduct 0x2338 JM20337 Hi-Speed USB to SATA & PATA Combo Bridge
bcdDevice 1.00
iManufacturer JMicron
iProduct 2 USB to ATA/ATAPI Bridge

Has an intelligent fix (or idea of a solution, even) to this bug
materialized? From what I understand, probing for metadata at/near the
"end" of the device is necessary auto-mounting/setting up/etc. any
devices not listed in /etc/fstab already and that "end" space for their
magic data/sequence.

I assume an approach like this won't work (or has already been proven to
fail?):

- get size from device
- start reading blocks (size-n) sectors and forward
- parse sectors for magic data
- continue until error is returned (b/c device reports no sector, etc.)
- stop reading
  
This bug, in combination with the failure of the kernel to robustly handle the apparent bug in the chipset of this particular adapter (see the thread at http://linux.derkeiler.com/Mailing-Lists/Kernel/2008-07/threads.html#08755) makes for craptastic times w/ this hardware. (unless that has been fixed since summer '08?) Out of curiosity, was anyone able to get a response from JMicron about the bug in the chipset?

-- 
USB Hard Drive Not Accessible, vol_id hangs
https://bugs.launchpad.net/bugs/264789
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