DETAILS: WD Caviar SE16 native SATA hard drive features 16 MB cache for lightning-fast performance. This reliable drive is fast, but still delivers technologically advanced acoustics and cool operation. Product Description WD Caviar SE16 WD2500AAKS - hard drive - 250 GB - SATA-300 Packaged Quantity: 20 (specifications are for single item) Type: Hard drive - internal Form Factor: 3.5 x 1/3H Dimensions (WxDxH): 4 in x 5.8 in x 1 in Weight: 1.3 lbs Capacity: 250 GB Interface Type: Serial ATA-300 Data Transfer Rate: 300 MBps Average Seek Time: 8.9 ms Spindle Speed: 7200 rpm Buffer Size: 16 MB Manufacturer Warranty: 3 years warranty ALTERNATE ITEM #: WD2500AAKS-20PK UPC: 0718037717098