IBM 5150 PC Technical Reference (6025005, August, 1981) (PDF)

(3) The write-protect sensor disables the Diskette Drive electronics
whenever a write-protect tab is applied to the diskette.
For Interface Information, refer to the Diskette Drive Adapter
section.
~ Diskettes
The IBM 5-1/4" Diskette Drive uses a standard 133.4 mm (5.25 in.)
diskette. For programming considerations, single sided, double density
soft sectored diskettes are used. The figure below is a simplified
drawing of the diskette used with the Diskette Drive. This recording
medium is a flexible magnetic disk enclosed in a protective jacket. The
protected disk, free to rotate within the jacket, is continuously cleaned
by the soft fabric lining of the jacket during normal operation.
Read/Write erase head access is made through an opening in the jacket.
Openings for the drive hub and diskette index hole are also provided.
_____ m
11--­
3.S6 mm
(D.140 INCH) 630 + 0.25 mm 133.4 mm
I - I~Fr{025+ 0.01 INCH) j- (5.251NCH)
I 1 ~~~~~~TlVE~ /' -- - - ---- "-..
I - JACKET I -, /
1 to IOXIDECOATED \\
SPINDLE
~ 9) E~ 133.4mm I MYLARDIS~.
~ @ ~~ {5025j1NCHI ( \0)
m gf LINER Ir~ ~ ~g~~ss /
1
___ '33.4mm -j- - ~.'-.... ·O~~~/:~TU/RE /
1... (5.25 INCH)
----
­
I
-----
RECORDING MEDIUM
2-111