Computer Programming 201

[CrystyB]

As much as i may like using the keyboard as opposed to the mouse, i have (and not on just one occasion) hit the Del key, or even the Shift-Del combo. I think you know what i mean.

This last time, i deleted ~150 megs of self-made pictures, htmls, texts and God knows what else. I've tried some unerasers, but they seem to be missing part of the folder structure i had in there.

After some low-level inspection (which, having been done for the first time, took a few cautious hours), i found out the reason was that some parts of the FAT chain have been zeroed out. I assume it just means that the respective cluster is free. correct me if i'm wrong, please.

Fortunately, i had a very small quantity of space left on that second, logical, partition, so if i save each cluster that is said to be free i get about 80% useful data! So now comes my real question: how do i read from FAT and from a specific cluster on my HDD?

Thanks in advance.

[This message has been edited by CrystyB (edited 08-17-2003 02:01 AM).]

[Vinny]

http://www.dewassoc.com/kbase/hard_drives/clusters.htm

What Hy said, Norton Utilities' Unerase

[Vinny]

and how is this Computer Programming?

[CrystyB]

since i would make my own C program to do what i need it to do.

And thanks for the reference. But I had already deduced much of what i did not know. :-\

[This message has been edited by CrystyB (edited 07-21-2003 09:40 PM).]

[CrystyB]

Hell. I've advanced a bit, but i'm stuck again.

I've just discovered _bios_disk and absread, but when i try to access the HDD (0x80) i get the 'error' 519. Actually, the return value is merely -1, but that's because AX has that 0x0207 value. Websearch did not help much. Where could i get more info on those?

[extropalopakettle]

You make geeks look ... a lot less geeky.

[jeep]

There are software packages that will restore files that have been deleted. But, since you want to do this yourself, how goes the battle?

Are you just looking for more info on abs* and _bios_disk?

[CrystyB]

umm i CAN'T just undelete. A whole directory tree has vanished, and i had at different times in there two sub-dirs with the same name. I want the second one, but all recovery software's i tried are linking both of them to the contents of the first one.

quote:

---

I've tried some unerasers, but they seem to be missing part of the folder structure i had in there.
[...]
some parts of the FAT chain have been zeroed out

---

So i only need the corresponding data.

And, yes, now i'm "just looking for more info on abs* and _bios_disk".

[This message has been edited by CrystyB (edited 08-17-2003 02:01 AM).]