here is the link for it, the exact one i bought from tigerdirect: »Here«
and here are the specs, if you don't have time to visit the link:
Specifications
Capacity (GB) Learn More 320
Interface Serial ATA-300
Spindle Speed (RPM) 7200
Buffer Memory 16MB
Average Latency (msec) 4.16
Maximum External Transfer Rate (Mbits/sec) 300
Data Transfer Rate on Serial ATA Up to 3000 Mb/sec
Logical Cylinders/Heads/Sectors per Track 16,383/16/63
Bytes Per Sector 512
Nonrecoverable Read Errors per Bits Read 1 in 10E14
Temperature, Operating (°C) 0 to 60
Temperature, Nonoperating (°C) -40 to 70
Shock, Operating: 2 msec (Gs) 68
Shock, Nonoperating: 2 msec (Gs) 300
Type OEM
Dimensions 1.028" x 5.787" x 4.0"
cheers
Pers