Date: Sat, 05 Oct 2013 15:35:24 +0200 From: "Julian H. Stacey" <jhs@berklix.com> To: usb@freebsd.org Subject: hot usb sticks Message-ID: <201310051335.r95DZOx4004869@fire.js.berklix.net>
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Has anyone else noticed how hot USB sticks can get when used for backup ? & also that IO errors occur after a while, which go away after a cold reboot. Not the whole stick, but the metal connector gets hot, so chip is hotter still. Obviously one won't notice this on large plastic encassed sticks, but 2 main sicks I use are: sandisk 2Gig metal case "vendor" "0x0781"; "product" "0x5151"; delock 8G miniature (~ 3mm of platic beyond plug) "vendor" "0x05e3" "product" "0x0727" I usually notice this when I am updating (writing) a crypted (gbde) UFS file systems using port/net/rdist6 (which only rewrites updated files). Source data is 1,446,438 K bytes in 42,611 files so average size of 34 K. But a lot of the files are really small, (~/.* config & mail files etc, so as rdist will be updating each one sequentially, & each will take a read + write cycle on a stick block, & as many small files will probably map to the same stick block, thats some concentrated cycles. More stick detail at http://www.berklix.com/~jhs/src/bsd/fixes/FreeBSD/src/jhs/etc/devd/jhs.conf Quite often I have to reboot my target host that has a stick inserted, I believe regardless of OS version on USB target host Possibly there might be less heating when only reading (as read cycles are also quicker), but mainly I'm backing up, writing. I was thinking of making a heatsink to clamp to a USB socket on an extension cable, but before that I'll try hanging a USB extension cable adjacent to a case fan. Cheers, Julian -- Julian Stacey, BSD Unix Linux C Sys Eng Consultant, Munich http://berklix.com Reply below not above, like a play script. Indent old text with "> ". Send plain text. No quoted-printable, HTML, base64, multipart/alternative.
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