ST-277R (bottom view): 65½Mb

Seagate ST-277R internal hard drive, circa 1990. With the focus on size and capacity in my post two days ago with a 32GB microSD card, here is a relative “dinosaur.” The capacity of this internal hard drive was 65.5Mb, yes, that’s *mega*bytes! (Physical dimensions: 8 × 5.6875×1.5".)

Technical specifications below; see also ftp://ftp.seagate.com/pub/techsuppt/rll/st277r.txt.

1 year ago (“More ‘leaf art’”): http://365project.org/rhoing/365/2013-01-14
2 years ago (“Sphere”): http://365project.org/rhoing/365/2012-01-14
3 years ago (“Just another sunrise? Maybe, but…”): http://365project.org/rhoing/365/2011-01-14

Technical specs of this Seagate hard drive:
UNFORMATTED CAPACITY (MB) ________________76.9
FORMATTED CAPACITY (26 SECTORS) (MB) _____65.5
ACTUATOR TYPE ____________________________STEPPER
TRACKS ___________________________________4,920
CYLINDERS ________________________________820
HEADS ____________________________________6
DISCS ____________________________________3
MEDIA TYPE _______________________________THIN FILM
RECORDING METHOD _________________________RLL (2,7)
TRANSFER RATE (mbits/sec) ________________7.5
SPINDLE SPEED (RPM) ______________________3,600
AVERAGE LATENCY (mSEC) ___________________8.3
INTERFACE ________________________________ST412
SECTORS PER DRIVE ________________________127,920
TPI (TRACKS PER INCH) ____________________777
BPI (BITS PER INCH) ______________________14,902
AVERAGE ACCESS (ms)*______________________40/28
SINGLE TRACK SEEK (ms) ___________________8
MAX FULL SEEK (ms) _______________________ /70
MTBF (power-on hours) ____________________70,000
POWER REQUIREMENTS: +12V START-UP (amps) _2.0/2.5*
+12V TYPICAL (amps) __0.5
+5V TYPICAL (amps) ___1.0/1.2*
TYPICAL (watts) ______11/12*
MAXIMUM (watts) ______29/36*
BUFFERED STEP PULSE RATE (micro sec) _____3-200
WRITE PRECOMP (cyl) ______________________N/A (821)
REDUCED WRITE CURRENT (cyl) ______________N/A (821)
LANDING ZONE (cyl)________________________AUTO PARK
IBM AT DRIVE TYPE _______________________**

*ST277R-0/ST277R-1

* MAY REQUIRE A CONTROLLER WITH BIOS SUPPORT, OR FORMATTING
AND PARTITIONING SOFTWARE. ALSO, CHECK TO SEE IF YOUR CMOS
SETUP HAS A "CUSTOM" OR "USER DEFINABLE" DRIVE TYPE AVAILABLE.

Seagate reserves the right to change, without notice, product offerings or specifications. (6/26/90)

[Rick Schies]

It is amazing at how far technology has come. When I think back to the days when I worked for GTE and we switched over to computers. Back then the computers all but filled a room with their huge reels, and the ticker tape they used to use. You remember those days

[MaryBeth Dailey]

Looks like a city map! I don't know how they get any of these things invented and built and made to work! Blows my mind.