Solid State - IC introduced 1959 by TI
- transistors etched on silicon wafer
- used for computer memory storage
- 33 minutes at 128 Kbps
- 32MB of rewritable built-in flash memory
- used in Diamond Rio
| Compact Disc - introduced 1980 by Philips/Sony
- 5-inch optical disk recorded by laser
- 44.1 kHz, 16-bit linear PCM
- 650 MB for 74 mins.
- used in Sony CDP-101
| Digital Audio Tape - introduced 1986 by Philips/Sony
- 3-inch cassette with tape 4mm wide
- 48, 44.1, 32 kHz, 16-bit linear PCM
- 90 minute tape at cost of $6
- used in Sony TCD-D3
| Helical Scan - introduced 1991 by Alesis
- S-VHS videocassette
- 44.1, 16-bit linear PCM
- 8 tracks each 100 microns wide
- used in Alesis ADAT
| MiniDisc - introduced 1992 by Sony
- 2.5-inch magneto-optical disk
- 44.1 kHz, ATRAC lossy compression 5:1
- 160 MB for 74 mins.
- used in Sony MiniDisc
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