Re: Zip 100 ATAPI not working, "qc timeout" and "failed to clear UNIT ATTENTION"

[Niklas Cassel <cassel@kernel.org>]

Hello Philip,

On Wed, Feb 19, 2025 at 08:04:50PM +0000, Philip Pemberton wrote:
> 
> I've been able to get a good read of a disk with ddrescue:
> 
> GNU ddrescue 1.27
> Press Ctrl-C to interrupt
>      ipos:  100597 kB, non-trimmed:        0 B,  current rate:    720 kB/s
>      opos:  100597 kB, non-scraped:        0 B,  average rate:   1070 kB/s
> non-tried:        0 B,  bad-sector:        0 B,    error rate:       0 B/s
>   rescued:  100663 kB,   bad areas:        0,        run time:      1m 33s
> pct rescued:  100.00%, read errors:        0,  remaining time:         n/a
>                               time since last successful read:         n/a
> Copying non-tried blocks... Pass 1 (forwards)
> Finished
> 
> I'm pretty chuffed with the data rate, 1MB/sec is far more than the
> externals manage.
> 
> I guess the question now is, how to fix this properly?

Please try this patch:
https://lore.kernel.org/linux-ide/20250221015422.20687-2-cassel@kernel.org/T/#u

and see if it fixes your problem.

Please also make sure to check that you can still write and read back what
you wrote to the device (with the read data matching the written data).


Kind regards,
Niklas