05-27-2009
Solved by restarting HAL
I just had this same issue on Ubuntu 9.04. My USB thumb drive was automounting correctly all day, and I made sure to unmount (eject) before removing it every time, but for whatever reason, it suddenly stopped mounting when I plugged it in.
Thanks to the links provided by techlinux, I learned a bit about HAL, and running "ps aux | grep hal" turned up a line like this:
hald-addon-storage: no polling because /dev/sdc is locked via HAL
With the usb drive unplugged, I restarted HAL, and that fixed the problem, hooray. However, the command is slightly different than specified in the HAL wiki. /etc/rc.d/hal doesn't exist (in fact, /etc/rc.d doesn't exist). This is the command I used:
sudo /etc/init.d/hal restart
Now.. how do we figure out what causes the polling/locked problem in the first place?
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pxfw(8) pxfw 0.5 pxfw(8)
NAME
pxfw - Firmware flashing tool for Plextor CD/DVD devices
SYNOPSIS
pxfw -l
pxfw -d DEVICE [-if firmware.bin] [-u] [-f] [-v]
pxfw -d DEVICE [-e] [-r] [-t] [-v]
DESCRIPTION
pxfw is the linux firmware flasher for Plextor CD and DVD drives. Remove any disks before flashing.
FEATURES
You can flash the firmware of these drives:
Plextor Premium, Premium-2, PX-712, PX-716, PX-755 and PX-760.
DEVICE
can be an IDE, SCSI, SATA, USB or FireWire connected optical drive. Not all SATA controller support all Plextor features.
Linux:
/dev/hdX: IDE device
/dev/scdX: Linux 2.4: SATA, SCSI, USB device, or IDE device via ide-scsi emulation
/dev/srX: Linux 2.6: IDE device via new ATA layer, SCSI or USB device
OpenBSD/NetBSD:
/dev/rcdX
FreeBSD:
/dev/cd: SCSI device
/dev/acd: ATA device
MacOS X:
/dev/disk:
win32:
C:,D:,E:, ... X:,Y:,Z:
OPTIONS
-l scan busses for all available CD and DVD devices
-if select inputfile. Specify the firmware binary file, which should
be written to DEVICE.
-u proceed update. When the firmware checksum test has succeeded,
write firmware to DEVICE.
-f force flashing. Even if DEVICE is not recognized, or firmware.
checksum has failed, firmware writing will be forced.
Handle with care.
-e read EEPROM from DEVICE.
-r reboot the device.
-t test which opcodes are supported by the device.
-v debug.
EXAMPLES
pxfw -d /dev/hdc -if 755_1.07.bin -u
writes firmware file 755_1.07.bin into Master Drive on Secondary IDE-Port.
pxfw -d /dev/sr3 -e -oe file.foo
reades EEPROM from device /dev/sr3 and writes it to file.foo.
please report man page improvements to T.Maguin@web.de
Gennady ShultZ Kozlov 02 April, 2009 pxfw(8)