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U Series 9 Product Manual, Rev. D 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
ST3160022A, ST3120025A, ST380012A, and ST360019A model drives.
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.
Drive specification ST3160022A ST3120025A ST380012A ST360019A
Formatted Gbytes (512 bytes/sector) 160 120 80 60
Guaranteed sectors 312,581,808 234,441,648 156,301,488 117,231,408
Bytes per sector 512
Default sectors per track 63
Default read/write heads 16
Default cylinders 16,383
Physical read/write heads 4 3 2 2
Discs 2 2 1 1
Recording density, BPI (bits/inch max) 595,000
Track density, TPI (tracks/inch max) 94,600
Areal density, (Mbits/inch
2
max) 56.3
Sustained data transfer rate OD (Mbytes/sec) 48
I/O data-transfer rate (Mbytes/sec max) 100
ATA data-transfer modes supported PIO modes 0–4
Multiword DMA modes 0–2
Ultra DMA modes 0–5
Cache buffer 1 Mbyte (1,024 kbytes)
Height (mm max) 26.035 mm (1.028 inches)
Width (mm max) 101.6 mm (4.000 inches)
Length (mm max) 146.99 mm (5.787 inches)
Weight (typical) 635 grams (1.4 lb)
Average latency (msec) 4.16
Power-on to ready (sec typical) 10 sec
Standby to ready (sec typical) 10 sec
Startup current (typical) 12V (peak) 2.8 amps
Track-to-track seek time (msec typical) <1.0 (read), <1.2 (write)
Average seek, read (msec typical) 8.5
Average seek, write (msec typical) 9.5
Seek power (typical) 12.5 watts