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The super-disk or LS-120 and its derivatives are a removable disk more akin to a zip disk or floppy disk. They are designed to be easily swapped from machine to machine. Physically they resemble a floppy disk in that it has an internal platter is composed of flexible plastic encased in a hard case for protection.
A hard disk is designed to reside permanently in the same computer and acts as the primary storage & boot device. A hard disk is a semi-sealed device inside the computer which has several rigid aluminum (usually) platters permanently encased within an aluminum shell.
Hard disks can read & write data at a much faster rate than superdisks.
Hard disks can store a great deal more data than superdisks.
Superdisks are generally considered to be obsolete these days, with thumb drives cd-rws and dvd-rws having taken their place as easily portable storage devices.
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