Two drives shows difference in file size, two drives shows difference in file size

i have two drives on 'Lacie' and other 'seagate'. Both the drives have identical data, basically they are backup drives.
File size that shows up at the bottom of finder window is different in both the drives.
They have a difference of 3kb data. Though the indivisual files on the both the drives shows the same size.
My question is why would be there any difference in file size if both the drives contains exactly the same data?

SORRY FOR THE DUPLICATE THREAD.....Heh, there's nothing to be sorry about :)
I post it just to help consolidate the posts, in case someone has same problem in future, they can find the whole thread.

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1) For some reason this happens once in a while with FAT32 enabled external harddrives. I have no idea why this happens but it most easily solved by reformatting the drive. First make sure you've copied everything from the external drive to your internal harddrive. You've done this earlier so I assume you know how to do this.
Now the reformatting part. Open Finder and go to Applications. Look for the folder called "Utilities". Click on it. In it you find a program called "Disk Utility". Click on it. Now look for the external drive. You probably see two entries for the disk. Click on the one that contains the name of the drive NOT the one that describes the disk (Like for example 320.07 GB Samsung S2 Portable Media).
Now you see four tabs in the righthand part of the window. They're called "First Aid", "Erase", "RAID" and "Restore". Click on "Erase". This opens the tab with (amongst others) a dropdownbox (Format) and a textbox (Name) . In the dropdownbox select "Mac OS Extended (Journaled). Take note! This selection disables usage of the drive with Windows PC's. If your goal is to share the drive with Windows PC's select the MS-DOS FAT option.
Enter a label for the drive in the textbox Name. Now click on the button "Erase". This will format the drive.
Now when it's done you can copy back all the items you've copied to your internal harddrive earlier.
2) Opening two windows like Explorer on Windows is opening two Finder windows on the Mac. Simply click on the background. In the menubar you items like 'Finder", "File", "Edit", "View", et cetera. Click on "File" and "New Finder Window". Do this two times. Alternatively you can click on the background and press CMD-N two times.
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Hello Again Gordon Bennet!,
The above was the easy fix for your problem which is an I/O issue.
If you want to live on the edge, AFTER making a backup, are you are familiar with with how to use 'Console'? It's in Applications-Utilties-Console.
If so, can you access the logs and see if the sort of read error that has been logged? It is also possible (although improbable) that the OS logged a detailed message elsewhere.
Good luck and even though not "solved" here in the iSight group, you might try your HD question in Computing Hardware and under your MacMini group to see if anyone has better answer/solution.
Respectfully,
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Hi,
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Hardware:
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x

Two drives shows difference in file size, two drives shows difference in file size

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