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Questions about file manipulation...

D

ddeder

Golden Member
A couple of things have been bothering me...

I downloaded a driver from the internet and stored it on my HD. I right click on the file and look at the properties and it tells me that the file contains 979KB(1,002,501), 1,003,008 bytes used.

I put a floppy disk in the A drive and copy the file to it. I then check the properties of the file on the A drive and it says 979KB(1,002,501), 1,003,520 bytes used.

What happened?! Does the file contain 1,003,008 bytes or 1,003,520 bytes? I copied the file to another floppy to verify that it isn't a problem with the floppy, same result.

My second question...

I copied a bunch of files to a floppy and then immediately tried to format the floppy. I get an error message saying something to the effect that one of the files is in use and I can't format. I don't get it. I rebooted the computer and then was able to format the floppy. What is going on here???
 
Notice that in both cases, on the HD and on the Floppy, the file is 979KB. (1,002,501 bytes. ) The other # is the amount of storage space the file takes up. Both of these numbers are correct. It has to do with cluster size. When a Disk is formated, it is given a certan size for clusters ( in Bytes, or KB, depending on size of original disk ) A file MUST use an entire cluster, as Clusters can not be split between files. Example:

Say you have a 10KB file on your HD
Your HD cluster Size is 5KB
Your Floppy Cluster is 3 KB

On your hard drive, the file uses 2 clusters, for a total used space of exactly 10KB.
That same file on your floppy would take 4 clusters, as 3 would only be 9KB, and not enough for the file. So it uses 4 for a total of 12KB.

Smaller drives = smaller clusters ( usually ) The smaller a cluster, generally the more efficent the HD/Storage system can be. A 1K file would use 5k on the above example on the HD as storage space, while the Floppy would only use 3K.
 
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