Acronis os selector 8.0 User Manual
2.12 64K Boot Code Limit
Some operating systems, namely MS-DOS 6.x and earlier versions, and
Windows NT 4.0 and earlier versions, have an error in the boot code in
converting the absolute sector number into cylinder, head, and sector
numbers. They suppose that the result of division of absolute sector number
by the number of sectors per track will not exceed 16 bits, i.e. 64 K. Since
most modern hard disks have 63 sectors per track, this results in 2016-
megabyte limitation of boot code location.
Windows NT 4.0 and earlier versions, have an error in the boot code in
converting the absolute sector number into cylinder, head, and sector
numbers. They suppose that the result of division of absolute sector number
by the number of sectors per track will not exceed 16 bits, i.e. 64 K. Since
most modern hard disks have 63 sectors per track, this results in 2016-
megabyte limitation of boot code location.
Be careful when moving a partition containing an operating system with the above-
mentioned limitation since the operating system may become unbootable.
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Chapter 2 : Basic Information