Features

• Part number
  • HDD2E51
• Formatted capacity
  • 320,073 MByte
• Form factor
  • 2.5 inch
• Interface type
  • Serial ATA
• Supported interface standards
  • ATA-8
  • Serial ATA 2.6
• Free Fall Sensor
  • Embedded
• Head/actuator technology
  • “Ramp-Load” Technology
  • PMR (Write)/TMR (Read)
• Shock detection
  • Shock sensor circuit
• S.M.A.R.T.
  • The SMART command set is supported.

Physical parameters

• Number of platters
  • 2
• Number of cylinders
  • 126,360
• Number of heads
  • 4
• Bytes/sector
  • 512

Access times

• Average seek time
  • 10.5 (Read)
    12 (Write) ms
• Maximum seek time
  • 19 ms
• Track-to-track seek time
  • 1 ms

Transfer rates

• Internal
  • From 434 MBit/s to 1020 MBit/s
• SATA (Host)
  • 3 Gbit/s

Rotational speed

• Rotational speed
  • 7,200 rpm

Buffer

• Buffer size
  • 16,384 kByte
• Cache
  • Read-ahead cache
  • Write cache

Reaction times

• Start time, typical (Up to Drive Ready)
  • 4 s
• Start time, maximum (Up to Drive Ready)
  • 10 s
• Recovery time (from stand-by, typical)
  • 4 s
• Recovery time (from stand-by, maximum)
  • 10 s

Reliability specifications

• MTTF
  • 600,000 Hours
• Seek error rate
  • 1 error per 10^6 seeks
• Non-recoverable error rate
  • 1 error per 10^14 seeks
• Product life
  • 5 years or 20,000 POH (whatever comes earlier)
• Preventive maintenance
  • No preventive maintenance is required

Power consumption

• Start (Maximum)
  • 5.5 W
• Seek (Average)
  • 2.2 W
• Read (Average)
  • 1.9 W
• Write (Average)
  • 1.9 W
• Low-power idle (Average)
  • 0.9 W
• Sleep (Average)
  • 0.13 W
• Stand-by (Average)
  • 0.18 W

Power supply

• Supply voltage
  • +5 V (+/- 5 %)
• Allowable noise/ripple
  • Max. 100 mV

Mechanical specifications

• Drive width
  • 69.85 mm
• Drive height
  • 9.5 mm
• Drive depth
  • 100 mm
• Drive weight
  • 0.114 kg
• Drive orientation
  • The drive can be installed in all axes (6 directions)
• Mounting instructions (Screwing)
  • Four screws should be tightened equally with 0.39 Nm torque. The depth should be 3.0 mm minimum and 3.5 mm maximum

Temperature

• Operating
  • From 5 °C to 55 °C
• Non-operating
  • From -40 °C to 60 °C
• Shipping
  • From -40 °C to 70 °C

Humidity

• Operating
  • From 8 % to 90 %
• Non-operating
  • From 8 % to 90 %
• Shipping
  • From 5 % to 90 %

Vibration

• Operating (Maximum)
  • 1 G, with 5 – 500 Hz
• Non-operating (Maximum)
  • 5 G, with 15 – 500 Hz

Shock

• Operating (Maximum)
  • 300 G, with 2 ms half sine wave
• Non-operating (Maximum)
  • 900 G, with 1 ms half sine wave
• Shipping (Maximum)
  • 0.7 m free drop with no unrecoverable error.Apply shocks in each direction of the drive’s three mutually perpendicular axes, one axis at a time.(Packed in Toshiba’s original shipping package)

Altitude

Acoustic noise

• Idle mode (Disk spinning)
  • Max. 25 dB
• Random seek
  • Max. 28 dB