Absolutely Tech

Why computer recognizes hard drive size to be less than whats printed on box

Once in a while, everyone must’ve been confused and intrigued about the hard drive sizes. The don’t give what the promise. I still remember when I bought my first 20GB harddisk and was surprised to see only 18.6 GB. I was about to return it back claiming it was damaged when I researched and found out why.

Here’s the explanation.
HDD manufacturers label and make the HDDs using 1000 bytes = 1kb (kilobyte), 1000kb = 1mb (megabyte) and so on. But according to computers 1024 bytes = 1 kb, 1024 kb = 1 mb and so on.
So, computer always will recognize less space due to different measurement values.

Take the analogy of money here. Say, you have a 100 cents, which is 1$ for normal people. Now some crazy guy believes that 120 cents make 1$. For him you won’t have a complete dollar, you’ll have 0.833$. Same is the case with computers. HDD manufacturers are the normal guys, while computer is the crazy one :D. Okay, that was a silly one but you get the drift.

For calculating actual disk space of any size of disk. Do this:
If you have a 40 GB HDD, calculate its equivalent in bytes using 1000 bytes =1 kb concept. As this is used by manufacturers.
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Re-detection of DMA mode in windows xp

My desktop computer was running extremely slow but it wasn’t like this before. Even formatting didn’t help, so I knew for sure that there was a problem with hardware. I was right on that, DMA mode wasn’t being detected by XP.

For your knowledge, DMA (Direct Memory Access) is a mode supported by modern hard-disks/DVD drives for much faster access times to device. To check if your HDD’s working on DMA mode, follow these steps:
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