External hard drive sleep issue

My external drive contains my share folder for DC++.
If I leave my computer on when I'm gone, my DC++ shows my share as 0 after a while.
The hard drive seems to unmount after a while, maybe because the enclose sleeps the drive after a while.
Is there any way to fix this?

hdparm cannot read or set anything, a communication error always occurs.
Also dmesg records some errors on the moment I try to read something from drive and it goes off (always after some period of inactivity) and also logs when it's then detected (some seconds after) and mounted correctly.
EDIT: dmesg output
usb 1-3: USB disconnect, address 41
sd 13:0:0:0: [sdb] Unhandled error code
sd 13:0:0:0: [sdb] Result: hostbyte=0x07 driverbyte=0x00
end_request: I/O error, dev sdb, sector 163055695
sd 13:0:0:0: [sdb] Unhandled error code
sd 13:0:0:0: [sdb] Result: hostbyte=0x01 driverbyte=0x00
end_request: I/O error, dev sdb, sector 163055695
usb 1-3: new high speed USB device using ehci_hcd and address 42
usb 1-3: configuration #1 chosen from 1 choice
scsi14 : SCSI emulation for USB Mass Storage devices
usb-storage: device found at 42
usb-storage: waiting for device to settle before scanning
input: Western Digital External HDD as /devices/pci0000:00/0000:00:1d.7/usb1/1-3/1-3:1.1/input/input23
generic-usb 0003:1058:0705.000F: input,hidraw0: USB HID v1.10 Device [Western Digital External HDD ] on usb-0000:00:1d.7-3/input1
scsi 14:0:0:0: Direct-Access WD 2500BMV External 1.75 PQ: 0 ANSI: 4
sd 14:0:0:0: Attached scsi generic sg2 type 0
usb-storage: device scan complete
sd 14:0:0:0: [sdb] 488397168 512-byte logical blocks: (250 GB/232 GiB)
sd 14:0:0:0: [sdb] Write Protect is off
sd 14:0:0:0: [sdb] Mode Sense: 23 00 00 00
sd 14:0:0:0: [sdb] Assuming drive cache: write through
sd 14:0:0:0: [sdb] Assuming drive cache: write through
sdb: sdb1
sd 14:0:0:0: [sdb] Assuming drive cache: write through
sd 14:0:0:0: [sdb] Attached SCSI disk
EXT2-fs warning: mounting unchecked fs, running e2fsck is recommended
Last edited by Vieira (2009-12-16 02:51:43)

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