Cloning to a second hard drive.

Matt555 said:
Is that 74.1 that you mentioned in GB? If so then that's normal to lose a bit of space.
Click to expand...

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.
 
Big B said:
As for the specific level of RAID, you'll want to use RAID 1, not 0, which is mirroing.
Click to expand...

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.

DavidNW said:
Its formatted and working fine - just puzzles me that the 80GB drive has showed up as 74.1 or whatever of free space, with nothing stored on it as yet.
Click to expand...

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!
 
megamaced said:
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!
Click to expand...

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
 
megamaced said:
1MB = 1,024KB

Notice that 1MB does not equal 1,000KB.

The hard drive manufacturers use the formula 1MB = 1,000KB (-24kb)
Click to expand...

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
 
megamaced said:
The manufacturers are simply ignoring (or disgarding) that extra 24KB
Click to expand...
I can understand this point because evertime we buy a disc we recieve less space in it.

megamaced said:
No Karanislove, it means we are losing 24KB on every MB.
Click to expand...
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.
 
Karanislove said:
80GB = 81920MB (80*1024) = 83886080kb (81920*1024)
Click to expand...

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.
 
beretta9m2f said:
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.
Click to expand...

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.
 
DavidNW said:
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.
Click to expand...

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.
 
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! :P

Dave.
 
You must log in or register to reply here.
Back
Top