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0
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1answer
50 views

MS DOS: how to unattendedly write specific byte on specific address on HDD, e.g.: write(000F3,FF) [closed]

How can I perform direct, low level writing to the hard drive under MS DOS in an unattended way? Specifically, I need to write to bytes on the MBR, but at the byte level, so FDISK, RPM, etc. won't do. ...
0
votes
1answer
22 views

Range of signed and unsigned data types

So if char is 1 byte hence it is 8 bits, right? So 2 ^ 8 = 256 and 0 to 255 is the range of char? How does this work with signed and unsigned ints? An int is 4 bytes, so 32 bits, so 2 ^ 32. 2 ^ ...
1
vote
0answers
104 views

16GB USB flash drive turned to 1GB after writing an ISO image onto it

I have a 16GB flash drive for almost seven years. It was all good before not long ago, when I tried to write a Ubuntu image onto it. I made it many times before and had no issues about. But this time, ...
1
vote
1answer
113 views

How are windows low level mouse events handled? [closed]

I couldn't find info anywhere around and im a bit curious, from C# where you have all nice buttons and classes and events to do all you please, im wondering how is this really implemented in a low ...
2
votes
2answers
218 views

Why CPU emulation is slow [closed]

Different CPU (IA-32, ARM9 etc.) operations should be equivalent in their nature (move, read, write data etc.). It shouldn't be that painful for different CPUs to emulate each other. But seems like ...
1
vote
2answers
438 views

Is it possible to set diagnostic lights on a Dell Optiplex GX520 PC?

I have a Dell PC with 4 diagnostic lights in the front that light up during POST and then remain off. Is it at all possible to manipulate them from Windows? Would writing to low memory locations using ...
0
votes
1answer
70 views

Possibility to stop low level access of RAM

Is it possible to stop specific programs from having access to low level RAM access of other programs. For example if you install Cheat Engine it allows you to scan and edit memory address of another ...
0
votes
0answers
18 views

Lowlevel format of SD card [duplicate]

My SD card is defect. I can see that some pictures are not correctly saved (can't be opened) and I can't take new pictures. If I want to format it in Windows (chosing fast or really) it cancels the ...
11
votes
4answers
1k views

Electricity speed and data transfer

I've read in some places that electricity is very slow. Then how can Internet traffic in copper wires be so fast? I think I have a great gap of knowledge about the low-level data transfer structure. ...
1
vote
2answers
645 views

Fix SD card that's reporting too large a size?

I have a 4 GB miniSD card that is reporting it has 6 GB of space as opposed to the 4 GB it's supposed to have. Is there any way to flash the card so it will report the proper size? ...
8
votes
3answers
7k views

Can I use something like the SSD TRIM command on a SD card?

SSD flash hard drives have started to support TRIM in order to avoid the slowdown that occurs after a while. How do I do something similar on a SD card ? Like reformating the SD card, but at a ...