I m so confuse plz clear my concept. My question is this that why mmory of 1GB does not show 1024MB ??? and also 40GB does not show the Accurate memory.Why it happens????

How are we to help you when you don't provide any information. Where are you looking to see your memory amount and how much is it showing. One possibility is that you have on-board graphics which is blocking out some of the memory for its use. For the hard drive, I would "guess" that the problem has to do with how drive manufacturers calculate GB vs how Windows calculated GB. Hard drive manufactures determine a drives size based upon 1,000 units, whereas Windows uses 1,024. So for a HD 1 GB = 1,000MB, 1MB = 1,000KB, & 1KB = 1,000 Bytes For Windows: 1GB = 1,024MB, 1MB = 1,024KB, & 1KB = 1,024Bytes Michael J

The difference is due to software and hardware system of measurements.

i am not satisfied.and i am talking about harddisk.in every harddisk i have seen that it doesnt show the accurate Giga Bite. as 40Gb or 80Gb does not have 40B and 80GB. what is the reason ??????????

Michael J explained it but maybe it didn't sink in. HDD manufacturer's use 1000 as their base figure when doing calculations rather than 1024. Therefore the true drive capacity is approx 93% of the rated capacity. 40GB x 93% = 37.2GB 80GB x 93% = 74.4GB As for memory...1GB = 1024MB. If it's showing up as less than that, a portion of the 1024MB is probably being used for the onboard video. Don't confuse memory & the hard drive...they're different things.

"i am not satisfied.and i am talking about harddisk.in every harddisk i have seen that it doesnt show the accurate Giga Bite. as 40Gb or 80Gb does not have 40B and 80GB. what is the reason ??????????" Oh well, if you're not satisfied... how about you actually provide some information as to what you are wanting info on. When you stated that a 40GB drive wasn't showing correctly you didn't state where you were looking to see that information or how much space you were seeing. Therefore there was no way to be certain what your problem was. It could have been due to the difference in how manufacturers report drive size (which looks to be the case) or it could have been due to the drive not being partitioned to it's full amount, or perhaps something else. The quality of the responses you get are directly proportional to the quality of the questions you ask. Michael J

It does have it. It is all there. You just don't know how to use it. I read it wrong and answer it wrong too. So get off my case you peanut.