Control Data Corporation BR8 SERIES Hardware Maintenance Manual page 11

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• FLEXIBLE DISKETTE
(Optional) ,
Diskette Dimensions
Useable Diskette Recording
Surfaces
Diskette Surface Diameter
Recording Radii
Diskette Surface Coating
Diskette Velocity
• READ/WRITE HEAD
Head Unit
Track Width
Track Spacing
Erase to Read/Write Gap
77834769 -D
CDC 421-60W, Single Density,or Equiv.
CDC 423-60W, Double Density, or Equiv.
8 x 8 inches (203. 2 x 203. 2mm)
(including jacket
1
7. 88 inches (200. 1mm)
Track 76 (inner) 2. 0290 inches (515mm)
nominal
Track 00 (outer) 3. 6123 inches (918mm)
nominal
Magnetic Oxide
360 rpm
1
0.013 in·,
0.02083 in.
0.035 in.
(0.33 mm)
(0.529 mm)
(0.889 mm)
1-3/1-4