From owner-freebsd-fs@freebsd.org  Wed Oct 19 06:33:24 2016
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To: Arrigo Marchiori <ardovm@yahoo.it>
cc: Arrigo Marchiori via freebsd-fs <freebsd-fs@freebsd.org>
Subject: Re: Random truncated files on USB hard disk with timeouts;
 how to debug?
In-reply-to: <20161019062812.GA93031@nuvolo>
From: "Poul-Henning Kamp" <phk@phk.freebsd.dk>
References: <20161018152715.GC89691@nuvolo>
 <51997.1476812624@critter.freebsd.dk> <20161019062812.GA93031@nuvolo>
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Date: Wed, 19 Oct 2016 06:33:21 +0000
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--------
In message <20161019062812.GA93031@nuvolo>, Arrigo Marchiori writes:

>It is a USB disk bought some years ago, that contains actually
>rotating platters. It has a Y-shaped cable, to get power from two
>ports.

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.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@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.