You *do* know about mount(8)/umount(8), right?

On Wed, Nov 14, 2012 at 04:22:20PM -0300, Marcos Laufer wrote:
> Hello, i'd like to inform a problem when dettaching an external 1TB
> USB disk drive , the system just freezes, i can't type anything.
> Also It stops responding to ping.
> If i don't unplug it then i can use the disk normally, i can copy
> and delete files with no problem. But as soon as i unplug the USB
> cord, the machine freezes.
> I've tested it on several machines, different OpenBSD versions
> starting from 4.3, i'm not asking for support, i know old OpenBSD
> versions are no longer supported, but this seemed pretty odd, i
> suppose that plugging and unplugging a USB disk should not cause any
> problems on any OS version.
> 
> These are the lines on dmesg about this disk:
> 
> 
> Nov 14 16:00:31 hq /bsd: umass0 at uhub0
> Nov 14 16:00:31 hq /bsd:  port 5 configuration 1 interface 0
> "Western Digital My Passport 0748" rev 2.10/10.15 addr 2
> Nov 14 16:00:31 hq /bsd: umass0: using SCSI over Bulk-Only
> Nov 14 16:00:31 hq /bsd: scsibus0 at umass0: 2 targets, initiator 0
> Nov 14 16:00:31 hq /bsd: sd0 at scsibus0 targ 1 lun 0: <WD, My
> Passport 0748, 1015> SCSI4 0/direct fixed
> Nov 14 16:00:38 hq /bsd: sd0: 953837MB, 512 bytes/sec, 1953458176 sec total
> Nov 14 16:00:38 hq /bsd: ses0 at scsibus0 targ 1 lun 1: <WD, SES
> Device, 1015> SCSI4 13/enclosure services fixed
> Nov 14 16:00:38 hq /bsd: ses0: unable to read enclosure configuration
> 
> Best regards,
> Marcos

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