"Disk not readable...", Verify & Repair fail, Zero Out, HFS+ still fail

First, a time machine error came up saying the volume could not be found. Tried disk verify, disk repair (in disk utility) restarting, reconnecting, but to no avail. On restarting, computer says "Disk was not readable by this computer." I then Zeroed out all the data and reformatted the drive to Mac OS Extended (Journaled). TM worked for most of the day until tonight when another error message came up saying that the next backup failed because it required 168GB, but only 49GB was available. Yet I had done virtually nothing since the last backup the hour earlier. I clicked "Back up Now" to try and get it to maybe re-evaluate the situation and maybe do the backup, but instead, I get the error that I got before - "The volume could not be found" (or something to that effect). Upon restarting, I again get "The disk you inserted was not readable by this computer".
Is there something I am doing wrong? What can I do to fix this, or prevent this from happening later?

Alias7 wrote:
"Disk Utility stopped verifying "disk2s1" because the following error was encountered: Filesystem verify or repair failed" In the details box, it says:
"Verifying and Repair volume "disk2s1"
Invalid node structure
Invalid B-tree node size
Invalid node structure
Invalid B-tree node size
Volume check failed.
Error: Filesystem verify or repair failed."
This is what the error message was before, and is what it is now.
You had these sorts of errors, then zeroed-out the drive, now you have them again?
There's only one conclusion: your drive is failing. They don't always just crash and burn.
Note that the volume name should be "Time Machine", but Disk Utility sees it as "disk2s1" for some reason.
That's it's internal name to OSX. Use +System Profiler+ (Apple menu, +About this Mac,+ then +More Info.+
Look in the sidebar for FireWire or USB (whichever it is), select it, and you'll see disk2s1 listed as BSD name.
Time Machine Buddy seems to freeze most of my other widgets (can't type in calculator, can't delete Time Machine Buddy). It doesn't seem to do anything either, It just sits there saying "Backup Status" and "Messages" but no messages, just "....".
That's not normal, if you've had a successful backup recently, or one currently in progress.
An earlier post had a similar problem, because somehow he didn't have permission to read his own system log. From the Finder menubar, select Go, then +Go to folder,+ then type /var/log
That should list, among other things, system.log Double-click it. If nothing shows in the center portion, post back and we'll fix it.
But your main problem is an unreliable drive.

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