But there was no indication the device went missing on the console.
And it wasn't until I unplugged it that da0 detached. Usually in the
past when it has started throwing errors the console was chatty about
why.
Warner
On Oct 26, 2009, at 2:59 AM, Hans Petter Selasky <hsela...@c2i.net>
wrote:
On Monday 26 October 2009 01:05:03 n...@ever.sanda.gr.jp wrote:
M. Warner Losh wrote:
I have a usb stick (8GB) on it. This stick has about 5GB of junk on
it at this point.
I tried to do 'cat * > /dev/null' recently, to measure how fast it
goes. It got about 1GB into the drive and then I got device missing
messages.
So devfs thinks the device went missing:
Warner-san, maybe it is caused by the hardware problem on the USB
flash
memory. Some chip on the memory might have too much heat when you
access
the memory at fast rate. Then it stops working.
What happens if you read from two USB disks at the same time?
If the device went missing the USB HUB signalled that. This is maybe
an
indication that the USB firmware on the device crashed. Maybe this
is due to
heat, or unhandled race conditions when the load goes high.
Try using "dd" and vary the block size from 512 to 65536 bytes. Does
it stop
working with all block sizes over time?
--HPS
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