Re: System hangs when using USB 3.0 HD with on Ubuntu

Mark Lord
2010-04-21T18:17:04Z

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On 04/21/2010 10:04 AM, Mark Lord wrote:
> Could the people experiencing issues with this hardware,
> please give the attached copy of hdparm (pre-release) a go
> on their troublesome systems, and report back?
>
> This version uses ATA_12 for PACKET IDENTIFY and any subsequent
> commands to a PACKET device (CD, DVD, TAPE, etc..),
> and ATA_16 for everything else.
..

Mmm.. got that wrong, I guess.

Let's try again. Does the attached copy of hdparm work for everybody
now? It uses ATA_16 by default, for everything.

And forces ATA_16 when it thinks it is talking to an ATAPI device.
Plus, it uses a sector count of one (1) for all IDENTIFY commands.

Note however, that USB-SATA bridge chips from other vendors have
always worked correctly without the need for the sector-count field.

Eg. The bridge that Western Digital uses in their external enclosures
has no trouble following the SATA/SATL spec of "n/a"
for the sector-count field.

Cheers

Mark

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