Editing MiniDisc (section)

=== Differences from cassette and CDs ===
[[File:Comparison disk storage.svg|thumb|Comparison of several forms of disk storage showing tracks; green denotes start and red denotes end. Some CD-R(W) and DVD-R(W)/DVD+R(W) recorders operate in ZCLV, CAA or CAV modes.]]
MiniDiscs use rewritable magneto-optical storage to store data. Unlike [[Digital Compact Cassette|DCC]] or the analog [[Compact Cassette]], MiniDisc is a random-access medium, making seek time very fast. MiniDiscs can be edited very quickly even on portable machines. Tracks can be split, combined, moved or deleted with ease either on the player or uploaded to a PC with Sony's [[SonicStage]] V4.3 software and edited there. Transferring data from an MD unit to a non-Windows PC can only be done in real time, preferably via optical I/O, by connecting the audio out port of the MD to an available audio in port of the computer. With the release of the Hi-MD format, Sony began to use [[Mac OS X]]-compatible software. However, the Mac OS X-compatible software was still not compatible with legacy MD formats (SP, LP2, LP4). This means that an MD recorded on a legacy unit or in a legacy format still requires a Windows PC for faster than real-time transfers.

The beginning of the disc has a table of contents (TOC, the System File area), which stores the start positions of the various tracks, as well as metadata (title, artist) and free blocks. Unlike a conventional cassette, a recorded song does not need to be stored as one piece on the disc, it can be scattered in fragments, similar to a hard drive. Early MiniDisc equipment had a fragment granularity of 4 seconds of audio. Fragments smaller than the granularity are not monitored, which may lead to the usable capacity of a disc shrinking over time. No means of defragmenting the disc is provided in consumer-grade equipment.

All consumer-grade MiniDisc devices have a copy-protection scheme called the [[Serial Copy Management System]]. An unprotected disc or song can be copied without limit, but the copies can no longer be digitally copied. However, as a concession, the last Hi-MD players can upload to PC a digitally recorded file which can be resaved as a [[WAV]] ([[PCM]]) file and thus replicated.