Random truncated files on USB hard disk with timeouts; how to debug?

Poul-Henning Kamp phk at phk.freebsd.dk
Wed Oct 19 07:22:23 UTC 2016

In message <20161019064315.GB93031 at nuvolo>, Arrigo Marchiori writes:

>> Y-cables are a big warning sign.
>> You can try plugging the "power-only" plug into a high quality 1
>> ampere USB charger, but that is no guarantee for success.
>Yes, I also thought so at first.
>But I also believe that if anything goes wrong at the hardware level,
>I should get a big warning from the kernel, instead of a funny
>apparently-truncated file, that returns to be readable at next

Only if the drive finds out something is wrong and tells the kernel.

If the drive has bad power supply, that may not happen.

Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

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