Julian H. Stacey wrote:
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.
I have a few USB sticks, some of them are really old (and fast!), for example 512MB A-Data with 200x speed, or 8GB 133x. These fast sticks are almost cool. Some cheap modern sticks are hot even if used as read-only for booting ZFS backup server, where whole base system is on UFS USB stick monted read-only and all writes are on ZFS partitions of 4 HDDs. Even in this RO scenario, the hot stick died after about 2 years. Writes on it was made about 3 times a year because of system or ports updates.
So in my case: newer -> cheaper -> slower -> hotter = shorter life. Miroslav Lachman _______________________________________________ freebsd-usb@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-usb To unsubscribe, send any mail to "freebsd-usb-unsubscr...@freebsd.org"
