I've mounted and umounted it fine for short periods. I could happily read and write no problem. IN KDE a lovely USB icon appears on desktop and I click it things are lovely. Right click and unmount no problem. Today I plugged it in and left it idle (with a browser cd'd in the mounted directory). I see this in the log file: : usb 2-1: new full speed USB device using uhci_hcd and address 3 : scsi3 : SCSI emulation for USB Mass Storage devices : Vendor: KM Model: DiMAGE X50 Rev: 1. : Type: Direct-Access ANSI SC SI revision: 02 : SCSI device sdb: 1984000 512-byte hdwr sectors (1016 MB) : sdb: Write Protect is off : sdb: assuming drive cache: write through : SCSI device sdb: 1984000 512-byte hdwr sectors (1016 MB) : sdb: Write Protect is off : sdb: assuming drive cache: write through : sdb: sdb1 : Attached scsi removable disk sdb at scsi3, channel 0 , id 0, lun 0 scsi.agent[12230]: disk at /devices/pci0000:00/0000:00:1d.0/ usb2/2-1/2-1:1.0/host3/target3:0:0/3:0:0:0 [ I guess success on pluggin it in ... ] ... [ then this ... ] : usb 2-1: USB disconnect, address 4 : sdb : READ CAPACITY failed. : sdb : status=0, message=00, host=1, driver=00 : sdb : sense not available. : sdb: Write Protect is off : sdb: assuming drive cache: write through : sdb : READ CAPACITY failed. : sdb : status=0, message=00, host=1, driver=00 : sdb : sense not available. : sdb: Write Protect is off : sdb: assuming drive cache: write through : sdb:<3>scsi4 (0:0): rejecting I/O to device being r : Buffer I/O error on device sdb, logical block 0 : scsi4 (0:0): rejecting I/O to device being removed : Buffer I/O error on device sdb, logical block 0 : scsi4 (0:0): rejecting I/O to device being removed : Buffer I/O error on device sdb, logical block 0 : scsi4 (0:0): rejecting I/O to device being removed : Buffer I/O error on device sdb, logical block 0 : unable to read partition table I also have a (huge) load of these - all the time - related or not? multipathd: no devmap found multipathd: can't get devmaps ... retry Now If I plug it in I get info in log file but no mount happens and no directory is made in /media/ : usb 2-1: new full speed USB device using uhci_hcd an d address 6 : scsi6 : SCSI emulation for USB Mass Storage devices : no devmap found : can't get devmaps ... retry : Vendor: KM Model: DiMAGE X50 Rev: 1. : Type: Direct-Access ANSI SCSI revision: 02 : SCSI device sdb: 1984000 512-byte hdwr sectors (1016 MB) : sdb: Write Protect is off : sdb: assuming drive cache: write through : SCSI device sdb: 1984000 512-byte hdwr sectors (1016 MB) : sdb: Write Protect is off : sdb: assuming drive cache: write through : sdb: sdb1 : Attached scsi removable disk sdb at scsi6, channel 0 , id 0, lun 0 .agent[13029]: disk at /devices/pci0000:00/0000:00:1d.0/ usb2/2-1/2-1:1.0/host6/target6:0:0/6:0:0:0 : no devmap found : can't get devmaps ... retry