CD-ROM. Ambient 1 & 2 are available on a single CD-ROM in Akai format, around 500Mb of data, containing "almost all the contents" of the two volumes, if your thinking of purchasing either of these discs and are able to read this format then I'd suggest you consider getting the CD-ROM version, in the UK its priced cheaper than getting the two audio versions separately.

The CD's are also available seperately in PC .WAV format..