Seagate 21MB 3.5 Inch MFM Hard Disk ST124. Vintage.USED. HAVE NOT BEEN TESTED .SOLD AS IT IS.

Legacy : ST124

Capacity:21.4 MB

Speed:3600 rpm

Average Read Time:40 ms

Cylinders:615

Heads:4

Sectors:17

ST - 124

UNFORMATTED CAPACITY (MB) ________________25.6 FORMATTED CAPACITY (17 SECTORS) (MB) _____21.4 ACTUATOR TYPE ____________________________STEPPER TRACKS CYLINDERS ________________________________615 HEADS ____________________________________4 DISCS ____________________________________2 MEDIA TYPE _______________________________THIN FILM RECORDING METHOD _________________________MFM TRANSFER RATE (mbits/sec) ________________5.0 SPINDLE SPEED (RPM) ______________________3,600 AVERAGE LATENCY (mSEC) ___________________8.3 INTERFACE ________________________________ST412 SECTORS PER DRIVE ________________________41,820 TPI (TRACKS PER INCH) ____________________824 BPI (BITS PER INCH) ______________________14,953 AVERAGE ACCESS (ms) ______________________40 SINGLE TRACK SEEK (ms) ___________________12 MAX FULL SEEK (ms) _______________________95 MTBF (power-on hours) ____________________150,000 POWER REQUIREMENTS: +12V START-UP (amps) _2.4 +12V TYPICAL (amps) __0.35 +5V TYPICAL (amps) ___0.8 TYPICAL (watts) ______8 MAXIMUM (watts) ______33 BUFFERED STEP PULSE RATE (micro sec) _____3-200 WRITE PRECOMP (cyl) ______________________N/A (616) REDUCED WRITE CURRENT (cyl) ______________N/A (616) LANDING ZONE (cyl)________________________670 IBM AT DRIVE TYPE