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In page Byte:

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The IBM System 360 and the related disk and tape systems set the byte at 8 bits and documented capacities in decimal units.[10] The early 8-, 5.25- and 3.5-inch floppies gave capacities in multiples of 1024, using "KB" rather than the more accurate "KiB". The later, larger, 8-, 5.25- and 3.5-inch floppies gave capacities in a hybrid notation, i.e., multiples of 1024,000, using "KB" = 1024 B and "MB" = 1024,000 B. Early 5.25-inch disks used decimal even though they used 128-byte and 256-byte sectors.[11] Hard disks used mostly 256-byte and then 512-byte before 4096-byte blocks became standard.[12] RAM was always sold in powers of 2.[citation needed]