I just received a replacement drive for a WD5001AALS 500GB Black that had some bad sectors. The "new" drive is a WD1001FALS white label 1000GB. While I'm not very pleased about the label, I thought that the size difference sort equaled things out, but I wasn't sure how it would effect my warranty, so I attempted to register it. It wouldn't accept registration because the drive was already registered to me. I pulled the drive out to check the serial number, and it definitely is the same as the one shown as being registered to me before. I've had a number of RMAs over the last year or two, so it is possible that it is a drive that I sent to them in the past, but I'm not certain, because I've not finished inventorying everything. In any case it seems very strange if I got back a drive that I had sent to them before. I'm going to have to check all of the drives in both of my computers and in the closet to see if somehow they duplicated serial numbers. I've never been very clear on how they figure the warranty period of an RMA drive, but in this case it actually goes a little beyond the remaining time that was left on the drive that I sent in. I was already a bit perturbed with WDC because of them changing their policy regarding the fact that they now require their customers to pay for shipping to them, even though they claim to save a little on cost when buying the shipping label though them. However I've found that they slip in a second charge listed as an IAT fee ($1.00), which should only be charged on some international transactions, and neither WDC nor myself are across any borders except state lines.