Error -50 problems on external HDD

I am having intermittent problems backing up to a USB external HDD (via ChronoSync). After a couple of days of successful backups they start failing with error -50. When this happens I am unable to write anything to the HDD. Restarting the computer fixes the problem for a day or so, but then it happens again. I do not think that there are any physical problems with the drive or cable because the drive is partitioned (3 partitions) and another partition is used by SuperDuper to make bootable backups and has not failed.
I see messages like this in Console which may be related:
2/11/09 1:34:05 PM Disk Utility[58300] Verifying volume “WORK-430GB”
2/11/09 1:34:05 PM fseventsd[40] gzflush(/Volumes/WORK-430GB/.fseventsd/0000000001299f05) returned -1
2/11/09 1:34:05 PM fseventsd[40] disk logger: gzclose() failed (-1/22) removing all old log files in /Volumes/WORK-430GB/.fseventsd
2/11/09 1:34:06 PM fseventsd[40] failed to unlink old log file /Volumes/WORK-430GB/.fseventsd/0000000001299841 (Invalid argument)
2/11/09 1:34:06 PM fseventsd[40] failed to unlink old log file /Volumes/WORK-430GB/.fseventsd/0000000001299f05 (Invalid argument)
2/11/09 1:34:06 PM fseventsd[40] failed to create the uuid file /Volumes/WORK-430GB/.fseventsd/fseventsd-uuid
2/11/09 1:34:32 PM fseventsd[40] Events arrived for /Volumes/WORK-430GB after an unmount request! Re-initializing.
2/11/09 1:35:06 PM mds[34] (/Volumes/WORK-430GB/.Spotlight-V100/Store-V1/Stores/A85D1BB6-7321-4197-B51A-04 27BCA3790F)(Error) IndexCI in ContentIndexOpenBulk:Unclean shutdown of /Volumes/WORK-430GB/.Spotlight-V100/Store-V1/Stores/A85D1BB6-7321-4197-B51A-042 7BCA3790F/live.2.; needs recovery
2/11/09 1:35:52 PM fseventsd[40] disk logger: failed to open output file /Volumes/WORK-430GB/.fseventsd/0000000002993106 (Invalid argument). mount point /Volumes/WORK-430GB/.fseventsd
2/11/09 1:35:52 PM Disk Utility[58300] The volume WORK-430GB appears to be OK.
2/11/09 1:35:52 PM mds[34] (/Volumes/WORK-430GB/.Spotlight-V100/Store-V1/Stores/A85D1BB6-7321-4197-B51A-04 27BCA3790F)(Error) IndexCI in copyFileOrFd:error (22) opening 0.indexGroups
2/11/09 1:35:52 PM mds[34] (/Volumes/WORK-430GB/.Spotlight-V100/Store-V1/Stores/A85D1BB6-7321-4197-B51A-04 27BCA3790F)(Error) IndexCI in recoverIndex:Unrecoverable error: could not recover groups file (0.)
2/11/09 1:35:52 PM mds[34] (/Volumes/WORK-430GB/.Spotlight-V100/Store-V1/Stores/A85D1BB6-7321-4197-B51A-04 27BCA3790F)(Error) IndexCI in CIMetaInfoCreate:Tried to create index when index already existed /Volumes/WORK-430GB/.Spotlight-V100/Store-V1/Stores/A85D1BB6-7321-4197-B51A-042 7BCA3790F
2/11/09 1:42:15 PM Disk Utility[58300] Verifying volume “WORK-430GB”
2/11/09 1:43:51 PM Disk Utility[58300] The volume WORK-430GB appears to be OK.
2/11/09 1:43:51 PM mds[34] (/Volumes/WORK-430GB/.Spotlight-V100/Store-V1/Stores/A85D1BB6-7321-4197-B51A-04 27BCA3790F)(Error) IndexCI in ContentIndexOpenBulk:Unclean shutdown of /Volumes/WORK-430GB/.Spotlight-V100/Store-V1/Stores/A85D1BB6-7321-4197-B51A-042 7BCA3790F/live.2.; needs recovery
2/11/09 1:43:51 PM mds[34] (/Volumes/WORK-430GB/.Spotlight-V100/Store-V1/Stores/A85D1BB6-7321-4197-B51A-04 27BCA3790F)(Error) IndexCI in copyFileOrFd:error (22) opening 0.indexGroups
2/11/09 1:43:51 PM mds[34] (/Volumes/WORK-430GB/.Spotlight-V100/Store-V1/Stores/A85D1BB6-7321-4197-B51A-04 27BCA3790F)(Error) IndexCI in recoverIndex:Unrecoverable error: could not recover groups file (0.)
2/11/09 1:43:51 PM mds[34] (/Volumes/WORK-430GB/.Spotlight-V100/Store-V1/Stores/A85D1BB6-7321-4197-B51A-04 27BCA3790F)(Error) IndexCI in CIMetaInfoCreate:Tried to create index when index already existed /Volumes/WORK-430GB/.Spotlight-V100/Store-V1/Stores/A85D1BB6-7321-4197-B51A-042 7BCA3790F
2/11/09 1:48:15 PM ctask[59236] Copy Operation Error: -50
Description: paramErr. error in user parameter list.
Path: /Volumes/WORK-430GB
Stage: 3
2/11/09 1:48:15 PM [0x0-0x19019].com.cocoatech.PathFinder[244] Path: /Volumes/WORK-430GB
and also these messages:
2/11/09 1:40:04 PM fseventsd[40] failed to unlink old log file /Volumes/Boot-300GB/.fseventsd/00000000028bce91 (Invalid argument)
2/11/09 1:40:04 PM fseventsd[40] failed to unlink old log file /Volumes/Boot-300GB/.fseventsd/00000000028dd237 (Invalid argument)
2/11/09 1:40:04 PM fseventsd[40] failed to create the uuid file /Volumes/Boot-300GB/.fseventsd/fseventsd-uuid
2/11/09 1:41:36 PM fseventsd[40] client 0x83de00 watching dev 234881029 but it has no path! ()
2/11/09 1:41:36 PM fseventsd[40] client 0x828800 watching dev 234881030 but it has no path! ()
Any suggestions about how to narrow this down will be appreciated. ChronoSync tech support is getting tired of trying to help me and I suspect that it is a Leopard problem.

Try repairing disk permissions.
Launch Disk Utility. (Applications/Utilities) Select MacintoshHD in the panel on the left, select FirstAid, then click: Repair Disk Permissions. Quit DU when it's finished and reboot.
And check here: What to do if your computer won't recognize a FireWire or USB device
*" ChronoSync tech support is getting tired of trying to help me and I suspect that it is a Leopard problem. "* Since ChronoSync wrote this software. If it's not Leopard compatible then Apple isn't responsible. Might be able to get more support here: http://www.econtechnologies.com/pages/support/support_faq.html
Carolyn

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