Seagate ST9250421ASG ユーザーズマニュアル

Momentus 7200.3 SATA Product Manual, Rev. C

3

Unless otherwise noted, all specifications are measured under ambient conditions, at 25°C, and nominal 
power. For convenience, the phrases the drive and this drive are used throughout this manual to indicate the 
ST9320421AS, ST9320421ASG, ST9250421AS, ST9250421ASG, ST9200421AS, ST9200423ASG, 
ST9160411AS, ST9160411ASG,  ST9120411AS, ST9120411ASG, ST980411AS and ST980411ASG models.

The specifications listed in this table are for quick reference. For details on specification measurement or defi-
nition, see the appropriate section of this manual.

 

 

 

 

 

 

Formatted Gbytes

 

(512 bytes/sector)*

320

250

200

160

120

80

Guaranteed sectors

625,142,448

488,397,168

390,721,968

312,581,808

234,441,648

156,301,488

Bytes per sector

512

Physical read/write heads

4

3

3

2

2

1

Discs

2

2

2

1

1

1

Cache (Mbytes)

16

Recording density in BPI

 

(bits/inch max)

1,334k

Track density TPI

 

(tracks/inch max)

190k

Areal density

 

(Gbits/inch

2 

max)

253

Spindle speed (RPM)

7,200

Average latency (msec)

4.17

Internal transfer rate

 

(Gbits/sec max)

1.1

I/O data transfer rate

 

(Gbits/sec max)

3.0 

ATA data-transfer modes 
supported

SATA 1.0, Serial ATA Revision 2.6

 

PIO modes 0–4

 

Multiword DMA modes 0–2

 

Ultra DMA modes 0–6

Height (max)

9.5 +/- 0.2 mm (0.374 +/- .0078 inches)

Width (max)

69.85 +/- 0.249 mm (2.75 +/- 0.0098 inches)

Length (max)

100.3 +/- 0.25 mm (3.95 +/- .010 inches)

Weight (max)

110 grams (0.238 lb)

105 grams (0.227 lb)

Power-on to ready

 

(sec typical)

4.0