I have been trying to figure out if this drive has a 2MB Buffer or a 8 MB Buffer. There are also 2 different models of WD Passports. One is WDXMS3200TN and the other is WDME3200TN. I wonder if each has a different version of the Scorpio in it. I know the XMS one is newer of the 2. My model number is WDXMS3200TN. I was in the process of cloning this particular drive so that I could replace it in my macbook. I know that it has the remnants of the WD scorpio in it. I just popped the WD Passort open....the hardware number is: WD3200BEVT-227CT0 Now if I do a search on WD3200BEVT I can see its a scorpio. Not sure what the other numbers are "227CT0" I know this external has been a popular purchase with the idea of switching the macbook internal ( I saw a bunch of threads). It scares me to put a HD with a 2MB buffer in my macbook. Some people will tell you straight out that its a 8 MB buffer. Here are some websites that support the 2mb theory: http://computers.pricegrabber.com/hard-drives/m/56966700/search=wdxms3200tn+2mb/st=query/ http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=3540619&CatId=136 http://stores.tomshardware.com/rating_getprodrev.php/product_id=56966700/id_type=M/st=pop/sv=review/ I worry that I just spent 149.00 on a HD that is has a 2 mb Buffer.