Seagate LD25 Product Manual - Page 9

Drive specifications - model

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2.0 Drive specifications 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 ST9402115AS and ST920217AS models. 2.1 Specification summary table The specifications listed in this table are for quick reference. For details on specification measurement or definition, see the appropriate section of this manual. Table 1: Drive specifications Drive specification Formatted Gbytes (512 bytes/sector)* Guaranteed sectors Bytes per sector Default sectors per track Default read/write heads Default cylinders Physical read/write heads Discs Recording density in BPI (bits/inch max) Track density TPI (tracks/inch max) Areal density (Gbits/inch2 max) Spindle speed (RPM) Internal transfer rate (Mbytes/sec max) I/O data transfer rate (Mbytes/sec max) ATA data-transfer modes supported Cache buffer (Mbytes) Height (max) Width (max) Length (max) Weight (typical) Average latency (msec) Power-on to ready (sec typical) Standby to ready (sec typical) Track-to-track seek time (msec typical) Average seek, read (msec typical) ST9402115AS ST920217AS 40 20 82,443,600 41,021,800 512 63 16 16,383 2 1 1 1 675,900 114,000 81 5,400 57.6 150 SATA 1.0, SATA II PIO modes 0-4 Multiword DMA modes 0-2 Ultra DMA modes 0-6 2 9.5 +/- 0.2 mm (0.374 +/- .0078 inches) 69.85 mm (2.75 +/- 0.0098 inches) 100.5078 +/- 1.57 mm (3.957 +/- 0.062 inches) 100 grams (0.22 lb) 5.6 4.0 3.0 1.0 (read), 1.5 (write)

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LD25 Series SATA Product Manual, Rev. C
3
2.0
Drive specifications
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
ST9402115AS and ST920217AS models.
2.1
Specification summary table
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.
Table 1:
Drive specifications
Drive specification
ST9402115AS
ST920217AS
Formatted Gbytes (512 bytes/sector)*
40
20
Guaranteed sectors
82,443,600
41,021,800
Bytes per sector
512
Default sectors per track
63
Default read/write heads
16
Default cylinders
16,383
Physical read/write heads
2
1
Discs
1
1
Recording density in BPI (bits/inch max)
675,900
Track density TPI (tracks/inch max)
114,000
Areal density (Gbits/inch
2
max)
81
Spindle speed (RPM)
5,400
Internal transfer rate (Mbytes/sec max)
57.6
I/O data transfer rate (Mbytes/sec max)
150
ATA data-transfer modes supported
SATA 1.0, SATA II
PIO modes 0–4
Multiword DMA modes 0–2
Ultra DMA modes 0–6
Cache buffer
(Mbytes)
2
Height (max)
9.5 +/- 0.2 mm (0.374 +/- .0078 inches)
Width (max)
69.85 mm (2.75 +/- 0.0098 inches)
Length (max)
100.5078 +/- 1.57 mm (3.957 +/- 0.062 inches)
Weight (typical)
100 grams (0.22 lb)
Average latency (msec)
5.6
Power-on to ready (sec typical)
4.0
Standby to ready (sec typical)
3.0
Track-to-track seek time (msec typical)
1.0 (read), 1.5 (write)
Average seek, read (msec typical)
<16