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Xerox 820
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===Disk storage=== Much CP/M software uses the Xerox 820's disk format, and other computers such as the [[Kaypro II]] are compatible with it.<ref name="derfler19821018">{{cite magazine | url=https://books.google.com/books?id=CjAEAAAAMBAJ&pg=PA59 | title=Kaypro IIβa low-priced, 26-pound portable micro | magazine=InfoWorld | date=18 October 1982 | access-date=22 October 2013 | last=Derfler |first=Frank J. | pages=59 |volume=4 |issue=41}}</ref> <ref name="byte198309">{{cite magazine | url=https://archive.org/stream/byte-magazine-1983-09/1983_09_BYTE_08-09_Portable_Computers_in_Depth#page/n221/mode/2up | title=The Kaypro II | magazine=BYTE | date=September 1983 | access-date=20 October 2013 |last1=Fager |first1=Roger |last2=Bohr |first2=John | pages=212 |volume=8 |issue=9}}</ref> The CRT unit contains the processor, and a large port on the back connected via heavy cable to a disk drive, allowing a wide variety of configurations. Disk drives can be [[Daisy chain (information technology)#Computer hardware|daisy-chained]] via a port on the back. {| class="wikitable" |- ! Component ! Capacity ! Tracks/disk ! Sectors/track ! Bytes/sector ! Notes |- | Dual 5.25" single-sided floppy drives | 81K usable single density, 155K double density | 40 | 18 or 17 | 128 or 256 | All floppy disks are soft-sectored |- | Dual 5.25" [[Double-sided disk|double-sided]] floppy drives | 172K usable SD, 322K DD | 80 | 18 or 17 | 128 or 256 | |- | Dual 8" single-sided floppy drives | 241K usable SD, 482K DD | 77 | 26 | 128 or 256 | |- | Dual 8" double-sided floppy drives | 490K usable SD, 980K DD | 154 | 26 | 128 or 256 | |- | 8" [[rigid disk drive]] | 8.19[[megabyte|MB]] | 1024 | 32 | 256 | Provided with one 8" double-sided floppy drive, which was expandable to three such floppy drives |} Reference: 820-II Operation Manual<ref name="opmanual"/>
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