Zone bit recording
In
The inner tracks are packed as densely as the particular drive's technology allows. The packing of the rest of the disks is changed depending on the type of disk. Zone recording was pioneered and patented by Chuck Peddle in 1961 while working for General Electric.[1]
With a CAV-drive the data on the outer tracks are the same angular width of those in the centre, and so less densely packed. Using ZBR instead, the inner zoning is used to set the read/write rate, which is the same for other tracks. This permits the drive to have more bits stored in the outside tracks compared to the inner ones. Storing more bits per track equates to achieving a higher total data capacity on the same disk area.[2]
However, ZBR influences other performance characteristics of the hard disk. In the outermost tracks, data will have the highest
Some other ZBR drives, such as the 800 kilobyte 3.5" floppy drives in the
Products that use ZBR
- GCRfor 17–21 sectors á 256 bytes in 4 writing speed zones)
- GCR for 11–19 sectors á 512 bytes in 9 rotation speed zones)[4]
- Apple Macintosh400K/800K floppy disk (combined ZBR, ZCAV and GCR)
- DVD-RAM
- Most
See also
- Zoned constant linear velocity(ZCLV)
- Constant linear velocity (CLV)
References
- YouTube
- ^ a b "Zoned Bit Recording". Archived from the original on 2000-08-17. Retrieved 2011-07-18.
- ^ "Working with Macintosh Floppy Disks in the New Millennium". Archived from the original on 2013-04-13. Retrieved 2013-04-18.
- Victor Business Products, Inc. June 1982. pp. 7–1..7–9. 710620. Archived(PDF) from the original on 2017-03-23. Retrieved 2017-03-23.
- ^ Electronic Design, Volume 35, Issues 8-15. 1987.
- ^ "Zoned bit recording Archived 2017-01-16 at the Wayback Machine". National Semiconductors. 1989.
- ^ example: "5K500.B SATA OEM Specification Revision 1.2" (PDF). Hitachi. 2009-03-17. p. 15. Archived from the original (PDF) on 2012-10-21. Retrieved 2011-07-29.