Calc CHS values for ntfs partition to create partition table

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Calc CHS values for ntfs partition to create partition table

Postby djevil1 » 2018-04-10 11:06


I want to recover data from my hdd with testdisk.

Testdisk therefore wants me to recreate the original partition table
and to assign the correct CHS values.

As I remember there was only one NTFS partiton, created with Windows 8.1 and its default settings.

So i probably had an:

MS-DOS table
1 Partition formatted with NTFS
1 disk with 500GB shown by fdisk as:

465.8 GiB, 500107862016 bytes, 976773168 sectors, Sector size 512 bytes

Testdisk's first guess was "Non partioned media"
with "CHS 60801 255 63 - sector size=512"

MS-Dos Partition is not available as option, but Intel (which is probably the same, isn't it?)

The "Analyse" option does not return valid values (for both, non-partioned media and Intel partition table):

Partition Start End Size in sectors

2 P EFI (FAT-12/16/32) 0 3 52 0 17 1 832

Bad relative sector.
check_FAT: Unusual number of reserved sectors 4 (FAT), should be 1.
check_FAT: Unusual media descriptor (0xf8!=0xf0)
Warning: number of heads/cylinder mismatches 64 (FAT) != 255 (HD)
Warning: number of sectors per track mismatches 32 (FAT) != 63 (HD)
3 P FAT12 4 85 18 5 25 20 12288 [Firmware]

Bad relative sector.
No partition is bootable

No, I had no FAT partition, but yes, the partion was not bootable.
Don't know, what it want about EFI, isn't it the "BIOS" (or its newer replacement) ?

However, now I need to define the partition table manually,

Can anyone help me to get the right values and how to proceed?

And: There is no really important data on it, nothing I cannot live without, would just only take some time to collect it together..
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Joined: 2018-04-10 10:53

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