EECS 183 Lecture Notes - Lecture 7: Punched Card, Maximum Capacity, Magnetic Storage

• School: U of M
• Department: Electrical Engineering And Computer Science
• Course: EECS 183
• Professor: Jeffrey Ringenberg

Document Summary

Punch cards and physical media: ibm punch card 1725-1975, maximum capacity is 960 bits. Stored information but not a lot: paper tape 1846-1990s, maximum capacity is a few dozen kb. Magnetic tape: ibm magnetic tape - 1951-present, maximum capacity is 1tb. Made backups of information: audio cassette tape early 1970s-late 1980s, maximum capacity is 1400. Process of rewinding: t10000 magnetic tape 2006-present, maximum capacity is about 1tb. Floppy discs: used magnetic media in a more compact and fast way. 8 floppy 1971-1976, maximum capacity is about 1. 2mb. 5. 25 floppy 1976-1982, maximum capacity is about 1. 2mb. 3. 5 floppy 1982-present, maximum capacity is about 1. 44mb. Zip drive 1994-2003, maximum capacity is about 750mb. Superdisk 1997-2000, maximum capacity is about 240mb. Jaz drive 1995-2002, maximum capacity is about 2gb: expensive because it stored more information. Optical discs: use lasers to store a lot of information. Laserdisc 1978-2000, about 120 minutes : heavy, giant cds. Blu-ray 2006-present, about 50gb: these brought up copyright issues.