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Re: USB Booting
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cordata51
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Jan 30 07 2:02 AM
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Hi
Well i tried that fat16 bootsector and it didnt work. So i opened the drive as logical drive in hex workshop and sequencially started numbering the sectors starting at the sector just beyond the bootsector at offset 0x1F0 from "Sector1" - "Sector17" and then i modified my test bootsector to scan every CHS combination for the "Sector" signature at offset 0x1F0 and heres a small list of what i found.....
CODE
Sector #
At 0x1F0 | H | C | S |
----------------------------
1 | 1 | 0 | 3D |
2 | 1 | 0 | 3E |
3 | 1 | 0 | 3F |
----------------------------
1 | 2 | 0 | 39 |
2 | 2 | 0 | 3A |
3 | 2 | 0 | 3B |
4 | 2 | 0 | 3C |
5 | 2 | 0 | 3D |
6 | 2 | 0 | 3E |
7 | 2 | 0 | 3F |
----------------------------
1 | 3 | 0 | 35 |
2 | 3 | 0 | 36 |
3 | 3 | 0 | 37 |
4 | 3 | 0 | 38 |
5 | 3 | 0 | 39 |
6 | 3 | 0 | 3A |
7 | 3 | 0 | 3B |
8 | 3 | 0 | 3C |
9 | 3 | 0 | 3D |
10 | 3 | 0 | 3E |
11 | 3 | 0 | 3F |
----------------------------
1 | 4 | 0 | 31 |
2 | 4 | 0 | 32 |
3 | 4 | 0 | 33 |
4 | 4 | 0 | 34 |
5 | 4 | 0 | 35 |
6 | 4 | 0 | 36 |
7 | 4 | 0 | 37 |
8 | 4 | 0 | 38 |
9 | 4 | 0 | 39 |
10 | 4 | 0 | 3A |
11 | 4 | 0 | 3B |
12 | 4 | 0 | 3C |
13 | 4 | 0 | 3D |
14 | 4 | 0 | 3E |
15 | 4 | 0 | 3F |
----------------------------
The appearance of the "Sector" signature i put on the device repeats in the same pattern, until i get tired of looking at it and restart the pc. So my question is why are these sectors repeating themselves.
My memory stick is a Memorex 256MB traveldrive, the fat16 header states the sector per track count as 0x3F, # of heads as 0xFF, and number of sectors is 498,624 dec, and 8 sectors before partition. So with that i calculated the number of tracks to be 32.
Tracks(cylinders) = 32
Heads = 255
Sectors per track = 63
I also notice whenever i open the drive in hex workshop it says the sector counts dont match and possible protection exists on the stick. this message appears on all flash memory devices i have except one very old 8mb compact flash which unfortunely i left at home and wont be able to get it for 2 weeks.
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