Hard Drive Sectors, Need to edit; Idiots guide needed

Let me start by saying that I know very little about editing hard drives, this may be simple, this may be not. I don’t know, but hopefully somebody can point me in the right direction.

Background; I wish to upgrade the hard disk in my DVD recorder, in order to do this I need to edit some data on a hard disk, the text pasted below comes from somebody who has done this;

[I]Before continue write down maximum number of sectors in HDD. Very often is written on top of disk drive. From this number subtract 8MB => 16384 sectors.
This number we will be call “NoS” (Number of Sectors) (for example my NoS=1953508784 [=1953525168-16384])

To 1st sector (sector No. 0), where is partition table,
to offset 1CA to 1CD write number NoS-4 (for me 1953508780) converted to HEX (for me 74702DAC) but write it backwards!!! (for me AC, 2D, 70, 74).

To 5th (sector No. 4)
to offset 024 to 027 write number NoS/4 (488377196) converted to HEX (1D1C0B6C) and write normaly (1D, 1C, 0B, 6C).

to offset 02C to 02F write number NoS/4 (1D1C0B6C HEX) subscracted by number written in offset 028-02B (00004000 HEX) and subscracted by number 0100 in HEX. (for my numbers: 1D1C0B6C-4000-100 = 1D1BCA6C) and write normaly (1D, 1B, CA, 6C)

to offset 04C to 04F write number NoS/4 (1D1C0B6C HEX) also subscracted by number written in offset 048-04B (00095100 HEX) and subscracted by number 0100 in HEX. (for my numbers: 1D1C0B6C-95100-100 = 1D12B96C) and write normaly (1D, 12, B9, 6C)

To 335,981th sector (sector No. 335980)
to offset 00C write number NoS/4 (1D1C0B6C HEX) also subscracted by number written in offset 008-00B (000D1300 HEX) and subscracted by number 0100 in HEX. (for my numbers: 1D1C0B6C-D1300-100 = 1D0EF76C) and write normaly (1D, 0E, F7, 6C)[/I]

I am lucky in that the hard drive I have has the same number of sectors. So what to enter has already been worked out for me, the issue I am having is where to enter the data.

I have connected the drive to windows, and can edit the hard drive sectors, but I dont know where to enter the information.

The screenshot above shows what I can see, so if we take the first part of the instructions;

To 1st sector (sector No. 0), where is partition table,
to offset 1CA to 1CD write number NoS-4 (for me 1953508780) converted to HEX (for me 74702DAC) but write it backwards!!! (for me AC, 2D, 70, 74).

I gather that I input AC, 2D, 70, 74 in sector 0, but where in sector 0? There are rows labeled 0000-01F0 with 16 (16x2) colums. Is the 1ca 1cd a grid referance?

Cheers,

MM

Is the 1ca 1cd a grid referance?

No. Each 2 digit number is a hexadecimal representation of the byte value at that location on the hard drive. So from your screenshot offset 0 has a value of EB offset 1=FE and so on. The first row has offset 0-15(hex 0-f),the second row offset 16-31(hex 10-1f)…so offset 1ca can be found by going to row 1c0 where offset 1c0=01,1c1=00,1c2=a5…1c9=00 and 1ca=fc,1cb=0d,1cc=44,1cd=3a …1ca-1cd are the values you need to change. I would make sure to backup the sector before changing anything though.Just write down what you change then you can change it back ifit dont work.