Epson Equity II - Manual (Page 73)

System diskette
A diskette that contains the operating system.
Tracks
Addressable, concentric circles on a diskette, resembling the grooves on
a record, which help to divide the diskette into separate accessible areas.
There are 40 tracks on each side of a double-sided, double-density disk-
ette and 80 tracks on each side of a double-sided, quad-density or a
double-sided, high-density diskette.
Write
To store data on a disk.
Write-protect
To prevent a diskette from being overwritten by placing a write-protect
tab over the notch on the side of the diskette or setting the
write-protect switch When a diskette is write-protected, you
cannot erase, change, or record over its contents.
User’s Guide C-7