Samsung Spinpoint T166 HD501LJ 500GB 3.5" 7200 RPM 16MB Cache SATA 3GB/s Internal HDD Hard Disk Drive HD501LJ/D. Samsung Model Number: HD501LJHDD Part Number: HD501LJ/DDell Part Number: DN133 0DN133 KR-0DN133 Specifications: Disk Family Spinpoint T166Form Factor 3.5" Capacity 500 GB (500 x 1 000 000 000 bytes) Number Of Disks 3 Number Of Heads 6Rotational Speed 7200 RPM Rotation Time 8.33 ms Average Rotational Latency 4.17 ms Disk Interface Serial-ATA/300 Buffer-Host Max. Rate 300 MB/seconds Buffer Size 16384 KB Drive Ready Time (typical) 10 seconds Average Seek Time 8.9 ms