<< Why can't I find any information about this drive on Maxtor's site? I'd like to verify that it's an AMA100 and would like to see how it stacks up against the drive that is offered at Newegg. Does anyone have any other information other than what's on BB or Staples website? >>
As previously stated, the information from Staples and Best Buy are badly outdated. Even the CSR's are quoting it as ATA66. (AFAIK, Maxtor has stopped making the ATA66 model months ago.)
Because BB/Staples information hasn't been updated, there is no way for you to obtain the amount of assurance that you seem to desire, other than the first-hand experiences of myself and others who have purchased this drive from Staples.
As h0vic stated, that ST# is for the kit, not the drive. The drive itself is model # 5T040H.
FWIW, if for some bizarre reason you actually get an ATA66 drive (which I'm 99.9% sure will not happen), you can always just return it to your local Staples B&M for a full refund.