I got yesterday's update to TTP 4.05. Since I'm running Tiger, I decided to redo the eDrive, which was not on my boot drive, but on a drive called "hold" which had 76 gigs of data (about 388,000 files). Before removing the eDrive using TTP (which one is required to do in order to install a new one) I ran both TTP and Diskwarrior on "hold" to ensure that it was OK.

I ran TTP4 and removed the eDrive from "hold." Then, using the new TTP4.05, I installed a new eDrive on a different volume without any difficulty.

However, when I went back to "hold" I found that it was trashed beyond repair. TTP4.05 could not fix it; DiskWarrior could not fix it; Disk Utility could not fix it. 388,000 files up in smoke.

As I write this, near midnight, I'm about an hour into a DataRescue X block-by-block file retrieval scan that is scheduled to take at least an hour more.

So: here's the warning. If you're about to replace an eDrive with a new one: BACK UP THE WHOLE VOLUME FIRST! There is (based on my experience) a -very- strong probability of trashing the volume that hold your old eDrive when you remove it.