Yeah, thought so, Matt. I'll live with it! Cheers, Dave PS. I'm looking for a download of RAID (apparently I need RAID 1 in my case). Looked quiet a bit on the Net, but haven't found a link yet. I'll press on.
That's what I said: RAID 1: Disk Mirroring/Dupexing Duplexing. RAID 0 is striping with no redundancy. It increases performance but doesn't provide any fault tolerance should a hard drive fail. Basically RAID 0 is pointless. Unfortunately that is normal, and here's why: 1MB = 1,024KB Notice that 1MB does not equal 1,000KB. The hard drive manufacturers use the formula 1MB = 1,000KB when calculating the size of the hard drive. This calculation is obviously incorrect and the manufacturers are cheating us of those extra megabytes! :x: Operating Systems do use the correct calculation, so that's why you see your drive as 74.1GB and not the advertised size of 80GB Think about it: On every 1MB, you are losing 24KB. That doesn't sound like much. But when you have an 80GB hard drive, those missing Kilobytes soon add up!
Thanks, Megamaced. Great info once again, and thanks to everyone. I now have the CD-ROM, DVD RW and new HD running thanks to you all!! A good day's work! Best regards, Dave
It means we must be getting 24kb extra on every GB coz manufacturers are calculating less than original and computer detects the right one. I didnt get your logic clearly
No Karanislove, it means we are losing 24KB on every MB. The manufacturers are simply ignoring (or disgarding) that extra 24KB
I can understand this point because evertime we buy a disc we recieve less space in it. Lets do some calculations, As per you say according to manufacturers 1MB = 1000kb so I suppose you must be saying that 1GB = 1000MB = 1000000kb according to Manufacturers. Which makes 80,000,000kb = 80,000MB = 80GB But you said computer detects the right amount, so according to computer it has to be 80GB = 81920MB (80*1024) = 83886080kb (81920*1024) So, according to computer it has to be 2GB approx more than the original disc space... I think I am somewhere wrong in caculations but can you plz give me correct calculations. I realy wants to know why do we get less space in Disks.
Your calculation's correct. The HD companies don't go by that calculation which is what the OS detects. The companies round 1024 to 1000. but still call 1000 a GB. So, if HD companies went by your and the OS's calculation they'd either have to supply more gigs to say its an 80 gig drive, OR say the truth its a 74.1 drive.
Yes, those lost GBs can really add up. My new HD is supposedly '80GB' but its 'Total Size' is 74.5GB (which is the correct, actual size of the disk). These manufacturors, eh! Just found a little tool that converts bytes into kilobytes, mega bytes and terabytes and thought it might be of some interest: www.t1shopper.com/cgi-bin/calculate.pl Dave.
PS. Can't seem to get the link to work in this forum window - not to au fait with inserting links. Maybe anyone interested can get to the site.
I think is is the correct link: http://t1shopper.com/tools/calculate Just tried it and it works! Dave
Just read the technical info on the calculator link about how manufacturers calculate HD capacity sizes - quiet interesting!
Thanks for the calculater David but my confusions still remains. How manufacturers are calculating? Why we get the less space than it has to be?
Okay 80GB from a manufacturer is using 1000 bytes as a kilobyte. so: 1MB = 1000 x 1000 1GB = 1000 x 1000 x 1000 80GB = 1000 x 1000 x 1000 x 80 Which is 80,000,000,000 So an 80GB hard drive from the manufacturer actually contains 80,000,000,000 bytes. The OS uses the calculations with 1024 byes = 1 kilobyte. so: 1MB = 1024 x 1024 1GB = 1024 x 1024 x 1024 80GB = 1024 x 1024 x 1024 x 80 So a true 80GB is 85,899,345,920 bytes. However the HDD only has 80,000,000,000 bytes meaning it has less space than the 80GB the manufacturer quotes. If the HDD has 74.5GB space (as the OS reads it) then: 1024 x 1024 x 1024 x 74.5 is almost equal to 80,000,000,000 (actual answer is 79,993,765,890) Does that make it clearer?
^_^ Good. Glad I could help, once it's laid out for you and it's smack bang in your face you can sometimes understand it better.
Yes, Matt, your calculations are absolutely correct, and based on my '80GB' drive, they work out precisely to the number of remaining bytes on my HD in 'My Computer.' Nicely explained formula, btw. Good illustrations on IDE cables, and now this -obviously a man that knows his stuff! Dave.
