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Partition Table Doctor 3.5 Cracked
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The partition table was introduced in 1983 with IBM PC DOS 2.0. This implementation was designed by David Litton of IBM, and was based on the model of the hardware-disk-partitioning code by which it ran in DOS 1.x. In DOS 2.0, the partition table had one primary partition, which could reside anywhere on the disk. The extended partition was a new data type, which was required to hold all other partitions.
The extended partition cannot start on the first track of a disk, and it could not be the first partition on a drive. However, the logic of DOS could still detect an extended partition when the first of its partitions was filling up the disk, as was the case in the hard drive of the XT. To enable DOS to boot off the partition table, the drive was still hard-wired with parameters that assumed a single partition on the disk. When DOS 2.0 was loaded, it would detect the extended partition and deduce that it was the first partition on the disk (in some cases, it might try to boot off the first extended partition, but that was not the default). One exception was that the standard DOS 16-sector boot loader, written by Paul Hovsepian, could correctly boot off the partition table. This boot loader was also derived from David Litton's code for DOS 1.x, which was used for the original IBM PC.
The boot code in the extended partition was used to boot off its secondary partitions, with their boot code. The extended partition was bootable as long as that was the first partition on a drive. DOS 2.0 could not boot off an extended partition, and that was probably true for any booter with BIOS support, since it relied on the disk partition table. The extended partition would confuse the logic of the boot loader, which depended on the disk sector structure. DOS 1.x could also detect an extended partition in a drive with its boot code enabled, and would boot 827ec27edc