What Does Hi-MD Mean?

Hi-MD refers to an enhanced form of MiniDisc for storing and playing of media. It is magneto-optical, whereby a laser is used for reading and a laser along with a magnet is used for writing Hi-MD format media. The Hi-MD format was developed form of a MiniDisc but is now considered obsolete, whereas the MiniDisc is still used in some areas.

Techopedia Explains Hi-MD

Announced in January 2004 by Sony, Hi-MD quickly became a popular choice for storing and sharing media due to its increased storing capacity, and ability to save non-audio data such as documents and other files, longer playback and recording time available per disc, improved codecs, wider compatibility, and better PCM algorithm. Hi-MD has a data storage capacity of 1 GB, whereas a simple MiniDisc can store data up to 350 MB.