DEC 8 Inch Formats
Digital Equipment Corporation used the following formats on 8-inch disks:
Category | Drive designation | DEC RX01 | DEC RX02 | ||
---|---|---|---|---|---|
App. size | 250 KB | 500 KB | |||
Drive | Heads (data surfaces) | 1 | 1 | ||
Spindle motor speed (RPM) | 360 | 360 | |||
Controller | Transfer rate (kbit/s) | 250 | 500 | ||
Encoding | FM | FM/MFM | |||
Media | Track density (TPI) | 48 | 48 | ||
Bit density (BPI) | 3,200 | 6,400 | |||
Density designation | SS SD | SS DD | |||
Geometry | Cylinders | 77 | 77 | ||
Sectors per track | 26 | 26 | |||
Total sectors per disk | 2,002 | 2,002 | |||
Sector size (bytes) | 128 | 256 | |||
Capacity | Formatted (bytes) | 256,256 | 512,512 | ||
Formatted (KB) | 250.25 | 500.5 | |||
SS = Single Sided; SD = Single Density; DD = Double Density; TPI = Tracks per Inch; BPI = Bits per Inch |
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