I'm trying to connect a WD 2TB external drive to my rhel 4 linux workstation via the usb connection. I want to copy large data files to the drive. The error message is below:

Type: Direct-Access ANSI SCSI revision: 02
SCSI device sdd: 3907017568 512-byte hdwr sectors (2000393 MB)
sdd: assuming drive cache: write through
SCSI device sdd: 3907017568 512-byte hdwr sectors (2000393 MB)
sdd: assuming drive cache: write through
sdd: [mac] sdd1 sdd2 sdd3 sdd4
Attached scsi disk sdd at scsi7, channel 0, id 0, lun 0
Attached scsi generic sg6 at scsi7, channel 0, id 0, lun 0, type 0
USB Mass Storage device found at 2
usbcore: registered new driver usb-storage
USB Mass Storage support registered.
HFS+-fs warning: Filesystem was not cleanly unmounted, running fsck.hfsplus is recommended. mounting read-only.


any ideas?


thanks.

The kernel is telling you that the filesystem on the external HDD may be corrupted, because it was not cleanly ("properly") unmounted the last time it was used.

It recommends that you run fsck.hfsplus on the disk to try to fix the problem. Please see man fsck for more information.

Meanwhile it is mounting the disk as read-only, so you cannot write to it and further corrupt the filesystem before you have had a chance to fix it.