Spinning Beach Ball Freeze with HFS: err 5

Ever since I upgraded to 10.5.x my iMac has been freezing more and more often. I noticed that every time the machine froze with the beach ball spinning so was the Time Machine indicator. I reformatted my LaCie HD that I was using to GUID and most (but not all) of the freezes have subsided. I have a second LaCie HD that I use for video (named Video HD)which along with my internal HD is part of my Time Machine back-up. Last evening my machine froze in the usual manner. I grabbed the console messages and saw:
7/7/08 7:48:13 PM kernel disk1s2: I/O error.
7/7/08 7:48:13 PM kernel HFS: err 5 reading VH blk (Video HD)
7/7/08 7:49:43 PM kernel disk1s2: I/O error.
7/7/08 7:52:13 PM kernel disk1s2: I/O error.
7/7/08 7:52:13 PM /System/Library/CoreServices/backupd[4279] Starting standard backup
7/7/08 7:56:43 PM kernel disk1s2: I/O error.
7/7/08 7:56:43 PM kernel HFS: err 5 reading VH blk (Video HD)
7/7/08 7:57:13 PM kernel disk1s2: I/O error.
7/7/08 7:59:43 PM kernel disk1s2: I/O error.
7/7/08 7:59:43 PM /System/Library/CoreServices/backupd[4279] Backing up to: /Volumes/TM HD/Backups.backupdb
7/7/08 8:04:13 PM kernel disk1s2: I/O error.
7/7/08 8:04:13 PM kernel HFS: err 5 reading VH blk (Video HD)
7/7/08 8:04:43 PM kernel disk1s2: I/O error.
7/7/08 8:07:13 PM kernel disk1s2: I/O error.
7/7/08 8:09:43 PM kernel disk1s2: I/O error.
7/7/08 8:12:13 PM kernel disk1s2: I/O error.
7/7/08 8:16:43 PM kernel disk1s2: I/O error.
7/7/08 8:16:43 PM kernel HFS: err 5 reading VH blk (Video HD)
7/7/08 8:17:13 PM kernel disk1s2: I/O error.
7/7/08 8:19:43 PM kernel disk1s2: I/O error.
7/7/08 8:22:13 PM kernel disk1s2: I/O error.
7/7/08 8:24:43 PM kernel disk1s2: I/O error.
7/7/08 8:29:13 PM kernel disk1s2: I/O error.
7/7/08 8:29:13 PM kernel HFS: err 5 reading VH blk (Video HD)
7/7/08 8:29:43 PM kernel disk1s2: I/O error.
7/7/08 8:32:13 PM kernel disk1s2: I/O error.
7/7/08 8:32:13 PM /System/Library/CoreServices/backupd[4279] No pre-backup thinning needed: 614.0 MB requested (including padding), 136.86 GB available
7/7/08 8:32:18 PM /System/Library/CoreServices/backupd[4279] Copied 2940 files (4.1 MB) from volume Shapiro HD.
7/7/08 8:36:43 PM kernel disk1s2: I/O error.
7/7/08 8:36:43 PM kernel HFS: err 5 reading VH blk (Video HD)
7/7/08 8:37:13 PM kernel disk1s2: I/O error.
7/7/08 8:39:43 PM kernel disk1s2: I/O error.
7/7/08 8:39:43 PM /System/Library/CoreServices/backupd[4279] Error: (-36) copying /Volumes/Video HD to (null)
7/7/08 8:39:43 PM /System/Library/CoreServices/backupd[4279] Copied 2941 files (4.1 MB) from volume Video HD.
7/7/08 8:44:13 PM kernel disk1s2: I/O error.
7/7/08 8:44:13 PM kernel HFS: err 5 reading VH blk (Video HD)
7/7/08 8:44:43 PM kernel disk1s2: I/O error.
Any help decoding HFS: err 5 would be greatly appreciated. Oh, I've updated to the latest system (using the Combo updater and have already run Disk Utility and Disk Warrior on the Video HD.
Thanks

Error 5 is an I/O error, which you're getting back from the filesystem after an attempted read (the reason you see explicit I/O errors and error 5's is that likely the driver is reporting one, and the filesystem is reporting the other). IMO, whatever is mounted at device disk1s2 is bad. Your reformats, repairs, etc may have remapped some bad sectors on that disk, but clearly hasn't repaired all of them (or, the disk is continuing to fail with new bad spots).
I would suggest that you make a backup of your system somewhere other than whatever is on disk1s2. I'd then retire that disk...

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