I am having the exact same issue with no resolution.
Mac OSX 10.6.2
Cavalry 1TB HD,
http://www.cavalrystorage.com/CAXB.htm (This drive was initially formatted for windows so I reformatted to Mac OS Extended (Journaled).
Name : 1TB Time Machine
Type : Volume
Disk Identifier : disk1s3
Mount Point : /Volumes/1TB Time Machine
File System : Mac OS Extended (Journaled)
Connection Bus : USB
Device Tree : IODeviceTree:/PCI0@0/EHC2@6,1
Writable : Yes
Universal Unique Identifier : removed for this post
Capacity : 1 TB (1,000,070,627,328 Bytes)
Free Space : 525.11 GB (525,111,394,304 Bytes)
Used : 474.96 GB (474,959,233,024 Bytes)
Number of Files : 882,204
Number of Folders : 182,508
Owners Enabled : No
Can Turn Owners Off : Yes
Can Be Formatted : Yes
Bootable : Yes
Supports Journaling : Yes
Journaled : Yes
Disk Number : 1
Partition Number : 3
My initial steps were the obvious. verify disk, repair disk, erase, restore, reformat... nothing seems to help. I even went as far as returning the HD for repair. This also did not resolve the issue.
When the problem occurs I also get a error in finder if I try to create a new folder. "The operation can't be completed. An unexpected error occurred (error code -50).
The only thing that seems to work is telling my iMac NOT TO SLEEP. This is a workaround that I'm not comfortable with. So to me it seems that this is a mac issue with mounting the HD after exiting sleep mode.
here are some of the errors that I get with verify and repair disk;
Verify and Repair volume “1TB Time Machine”
Checking Journaled HFS Plus volume.
Checking extents overflow file.
Checking catalog file.
Checking multi-linked files.
Checking catalog hierarchy.
Checking extended attributes file.
_*Incorrect number of extended attributes*_
_*(It should be 831703 instead of 831700)*_
_*Incorrect number of Access Control Lists*_
_*(It should be 831702 instead of 831699)*_
Checking multi-linked directories.
Checking volume bitmap.
Checking volume information.
Repairing volume.
Rechecking volume.
Checking Journaled HFS Plus volume.
Checking extents overflow file.
Checking catalog file.
Checking multi-linked files.
Checking catalog hierarchy.
Checking extended attributes file.
_*Invalid map node*_
Checking multi-linked directories.
Checking volume bitmap.
Checking volume information.
Repairing volume.
Rechecking volume.
Checking Journaled HFS Plus volume.
Checking extents overflow file.
Checking catalog file.
Checking multi-linked files.
Checking catalog hierarchy.
Checking extended attributes file.
Checking multi-linked directories.
Checking volume bitmap.
Checking volume information.
The volume 1TB Time Machine was repaired successfully.
Volume repair complete.Updating boot support partitions for the volume as required.
Message was edited by: shwa
Message was edited by: shwa