Gateway 40GB 7200 RPM SATA Hard Drive with 2MB Cache - WMEHDS722504VLSA80

Feature	Specification
Physical Layout
Label Capacity	40 GB
Bytes per Sector	512
Sectors per Track	567-1170
Number of Heads	1
Number of Disks	1
Data Sectors per Cylinder	567-1170
Data Cylinders per Zone	1444-4501 (90 KTPI) 100-6846 (87 KTPI)
Logical Layout
Number of Heads	16
Number of Sectors per Track	63
Number of Cylinders	16 383
Number of Sectors	80 418 240
Total Logical Data Bytes	41 174 138 880
Mechanical Performance
Data Transfer Rates	757 Mb/s
Interface Transfer Rates	100 Mb/s
Data Buffer Size	8192 KB
Rotational Speed	7200 RPM
Number of Buffer Segments	Read: Up to 128 Write: Up to 63
Recording Density	689 Kbpi max.
Track Density	87/90 TPI
Areal Density	62 Gbits/in2 max.
Number of Data Bands	30
Command Overhead (Drive is in quiescent state when command is given)
Read (Cache Not Hit)	0.5 ms typ. (from Command Write to Seek Start)
Read (Cache Hit)	0.1 ms typ. (from Command Write to DRQ)
Write	0.015 ms typ. (from Command Write to DRQ)
Seek	0.5 ms typ. (from Command Write to Seek Start)
Seek Times (Including Settling)
Average Seek Time	Read: 8.5 ms typ. 9.5 ms max. Write: 9.5 ms typ. 10.5 ms max. Read (Quiet Seek mode): 19.5 ms typ. 20.5 ms max. Write (Quiet Seek mode): 20.5 ms typ. 21.5 ms max.
Full Stroke Seek Time (Without Command Overhead)	Read: 15.1 ms typ. 18.1 ms max. Write: 16.1 ms typ. 19.1 ms max. Read (Quiet Seek mode): 32.5 ms typ. 35.5 ms max. Write (Quiet Seek mode): 33.5 ms typ. 36.5 ms max.
Head Switch Time	1.4 ms typ.
Cylinder Switch Time	1.7 ms typ.
Single Track Seek Time (Without Command Overhead)	Read: 0.8 ms typ. 1.5 ms max. Write: 1.3 ms typ. 2.0 ms max. Read (Quiet Seek mode): 0.8 ms typ. 1.5 ms max. Write (Quiet Seek mode): 1.3 ms typ. 2.0 ms max.
Average Latency	4.17 ms
Electrical
Input Voltage Supply	+5 V +12 V
Input Voltage During Run and Spin Up	5 V ±5% 12 V +10%
Absolute Max Spike Voltage	5 V: ?0.3 to 7 V 12 V: ?8% ?0.3 to 15 V
Power Usage
Idle Sverage	+5 Volts: 400 mA +12 Volts: 300 mA Total: 5.6 W
Low RPM Idle	+5 Volts: 230 mA +12 Volts: 130 mA Total: 2.7 W
Unload Idle Average	+5 Volts: 230 mA +12 Volts: 270 mA Total: 4.4 W
Random R/W Average	+5 Volts: 540 mA +12 Volts: 590 mA Total: 9.8 W
Silent R/W Average	+5 Volts: 570 mA +12 Volts: 370 mA Total: 7.3 W
Start Up (max)	+5 Volts: 960 mA +12 Volts: 1700 mA
Standby Average	+5 Volts: 230 mA +12 Volts: 20 mA Total: 1.4 W
Sleep Average	+5 Volts: 190 mA +12 Volts: 20 mA Total: 1.2 W
Physical
Dimensions (W × W × L)	Approximately 25.4 × 101.6 × 146.0 mm
Weight	640 grams max.
Environmental
Temperature	Operating: 5° C to 55° C Non-operating: ?40° C to 65° C
Relative humidity	Operating: 8 to 90% non-condensing Non-operating: 5 to 95% non-condensing
Maximum wet bulb temperature	Operating: 29.4° C non-condensing Non-operating: 35° C non-condensing
Maximum temperature gradient	15° C/hour
Altitude	Operating: ?300 to 3 048 m Non-operating: ?300 to 12 000 m
Regulatory
Certifications	UL CSA TUV CE C-Tick