Later F and FM models of the 520 had a built in double-sided disk drive instead of a single-sided one.

(Apple only produced double-sided 5.25" disks for the Lisa 1 computer).

Up to 20 files could be kept on each side of the double-sided floppy disks.

Toshiba and Time Warner proposed a double-sided disk made up of two 0.6-millimeter layers bonded together.

With the 128's extra memory, faster drives, double-sided disks and an 80-column screen available, that version of GEOS should be worth waiting for.

In computer science, a double-sided disk is a disk of which both sides are used to store data.

The term "single sided disk" was not common until the introduction of double-sided disks, which offered double the capacity in the same physical size.

This became common practice, even more so since single-sided media became rarely available with prices matching those of double-sided disks.

The proposed system would use a double-sided disk.

Double-layered DVD's will hold 8.5 billion bytes, and double-sided disks will double those numbers.