TM problem "Unable...Error occurred while creating backup directory."

TM has faithfully created backups until 2/3/09 to my Western Dig 300 GB external, USB connected. It still has room for 238 GB data. Now it gives me this error message:
Starting standard backup 02/09/09
Backing up to:/Volumes/Time Machine: Ext HD/Backups.backupdb
Failed to create progress log file at path:/Volumes/TM:Ext HD/Backups.backupdb/iMac's
computer(3)/2009-02-03-02-754.in Progress/.Backup.255910073.264303.log.
Error: (-50)Creating directory 74D63BBC-4DB4-4A10-BE6C-C78DA438D63C
Failed to make snapshot
Backup failed with error:2
I downloaded CarbonCopyCloner, thinking I may have to erase External drive and start over,...but it also failed with a LONG< LONG error message. Can anyone help?

kornkid wrote:
When I tried to repair Ext drive, this message appears after only about 30 seconds:
"Time Machine:Ext HD" could not be mounted.
mounted or unmounted? I suspect it's the former.
I've never booted up from Leopard install disk. Can you give me steps?
while the problem seems to be with your TM disk you can try repairing both of them from the install DVD. insert the DVD and reboot normally. hold "c" at the chime. you'll be booted into leopard installer. once past the language selection screen choose 'disk utility" from Utilities menu at the top.

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