Just got a Western Digital WD5000LPVT, it is a 500GB single platter 2.5" mobile drive for ultrabooks. I first heard about it about a month ago when Western Digital put out a press release talking about its size (7mm tall) and the fact that it uses mounting holes in the same place as normal laptop hard drives so that it can fit in standard mounts/enclosures.
What got me really interested in this drive is its audio spec: http://www.wdc.com/wdproducts/library/S ... 701278.pdf
which rates it at 17dBA idle and 22dBA active I had a pair of WD7500BPVTs (in Western Digital Passport SE enclosures) which are listed a couple of columns over in the same spec sheet which were very quiet but for sure not silent and they are rated at 22dBA idle and 25dBA active. The difference between 17dBA and 22dBA is huge.
The drive came this afternoon (ordered it from Buy.com last week for $76 but it is a little higher now) and it is formatting as I type. It is about 18 inches from my head in open air and I honestly can't hear it. After all these years of buying the latest quiet drive just to be disappointed when I finally plugged it in, the WD5000LPVT is even better than I expected. I still can't believe it.
There is a review of the drive at StorageReview: http://www.storagereview.com/western_di ... wd5000lpvt
but it only covers performance. This drive is begging for a review at SPCR.