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In hexadecimal, this is an offset of 100,000 hex (100000h = 1 Mi B).The main reason Microsoft gave for doing this is found in their article, KB-923332; with the number of sectors given only in hex: 0x800 = 2048 and 0x3F = 63.So here's a case where under Microsoft Windows, a simple clean OS install not only has two partitions, but also has the drive letter C: assigned to the second partition on the disk; not the first.=========================================================================== | B | FS TYPE | START | END | | | | F | (hex) | C H S | C H S | RELATIVE | TOTAL | =========================================================================== | * | 07 | | nnnnnnnn | | | 00 | 0 0 0 | 0 0 0 | 0 | 0 | | | 00 | 0 0 0 | 0 0 0 | 0 | 0 | =========================================================================== Figure 1. (for disks with 255 heads) rather than the 1023,254,63 we had become so familiar with seeing on many user's computers.The whole first entry above will appear as follows in a disk editor (showing the actual hex bytes rather than decimal values in the table above): "80 20 21 00 07 " (see below), where the Head and Sector values are 20h and 21h (in Cylinder 00h) for the Starting Sector.Running BCDEDIT without any switches will display a few facts about BOOTMGR and the Windows Boot Loader (another program first created for Vista); which is the Windows 7 OS Loader: Like Vista, if you install Windows 7/8/10 on a hard disk with no existing partitions, the first partition will start at Absolute Sector 2048 (counting from zero; Sector 0 is where the MBR is located).

NOTE: For a Laptop/Notebook PC, the BIOS may use a different pseudo-CHS geometry translation for its 'Head' value.

Basically, since the starting offset for many disks, including the majority of Windows XP OS installs, was 63 (an odd number), they chose a starting offset that should give an even number of sectors for any large-sector drive manufacturers produce.

It would cause performance issues on large-sector drives if there were a "misalignment" between the size of a physical sector and the partition(s).

[Note: For a Windows 8 OS install, the first partition is set to a size of 350 Mi B (i.e., 716,800 sectors).] Users may also be confused by the fact that although this partition is set as the Active partition, it's often hidden from them due to having no drive letter assigned to it; in which case, you need to use Disk Management (see Figure 3 below; if running Win 7, enter: diskmgmt into the "Search programs and files" box to open it) or some other utility to see the PC's partitions.

Otherwise, if it is assigned a drive letter, it will be volume E:, since the DVD drive has traditionally been assigned to D:.

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