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2. Timeline of binary prefixes - Wikipedia

   en.wikipedia.org/wiki/Timeline_of_binary_prefixes

   "The drives are soft sectored, single or double sided, with 40 tracks per side. They are Modified Frequency Modulation (MFM) coded in 512 byte sectors, giving a formatted capacity of 163 840 bytes per drive for single sided and 327 680 bytes per drive for double sided." Seagate ST 506/412 OEM Manual [81]

3. Optical storage - Wikipedia

   en.wikipedia.org/wiki/Optical_storage

   Single-layer DVDs can hold 4.7 GB, while dual-layered can hold 8.5 GB. This can be doubled to 9.4 GB and 17 GB by making the DVDs double-sided, with readable surfaces on both sides of the disc. HD DVDs were able to store 15 GB with a single-layer and 30 GB with a dual-layer.

4. Disk II - Wikipedia

   en.wikipedia.org/wiki/Disk_II

   Disk II drives. The Disk II Floppy Disk Subsystem, often rendered as Disk ][, is a 5 + 1 ⁄ 4-inch floppy disk drive designed by Steve Wozniak at the recommendation of Mike Markkula, and manufactured by Apple Computer It went on sale in June 1978 at a retail price of US$495 for pre-order; it was later sold for $595 (equivalent to $2,780 in 2023) including the controller card (which can ...

5. Timeline of DOS operating systems - Wikipedia

   en.wikipedia.org/wiki/Timeline_of_DOS_operating...

   Single-sided 180 KB (184,320 bytes; 360 sectors) and double-sided 360 KB (368,640 bytes; 720 sectors) diskettes require more than the maximum 340 FAT entries a 512-byte sector can hold, so the FAT size is doubled, leaving 351 sectors (179,712 bytes) for data on single-sided disks and 354 clusters (362,496 bytes) [E] on double-sided disks.

6. AOL.com - News, Sports, Weather, Entertainment, Local & Lifestyle

   www.aol.com

   AOL latest headlines, entertainment, sports, articles for business, health and world news.

7. IBM Personal Computer - Wikipedia

   en.wikipedia.org/wiki/IBM_Personal_Computer

   Up to two internal 5.25-inch single- or double-sided full-height floppy disk drives [54] Port for attaching to cassette tape recorder Initially no hard drive option, but see text Expansion Five 62-pin expansion slots attached to 8-bit CPU I/O bus IBM 5161 Expansion Chassis with eight (seven usable) extra I/O slots Communication