I have a USB hard drive. Whenever I open two programs which utilise the USB hard drive simultaneously, these programs, i assume when they attempt to write to the hard drive lock up due to what i suspect must be some issue with the USB driver and perhaps a deadlock involving multiple concurrent accesses to the drive. When they attempt to access the drive the programs can lock up for several minutes before being unblocked. When only one program is using the drive this behaviour does not seem to occur.
It seems most likely that this is a USB level problem involving the USB drivers. I am using FreeBSD 7.1. It is annoying behaviour to say the least and I wonder what can be done about it, and if this issue is being addressed, perhaps in the recent redesign of the USB code. It seems to be a pretty consistent issue, happening with multiple installs of FreeBSD and different drives.
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