[Copy of drive - why do size vary?]

The two sets of numbers are not the same thing.

Windows allocates space in blocks, not in single bytes: each block is usually (but not always) 4096 bytes. On a flash drive, or external drive with FAT/FAT32 formatting it may be much bigger (4096, 8192, 16384...). So the "allocated" size for a 1-byte file will be actually 4,096 bytes or more.

The first three sizes are "allocated" sizes. The second pair of sizes are the actual file sizes added together.

Thank you.

Ok; so - bottomline - as long as I got no errors when copying there is nothing to worry about?

[Copy of drive - why do size vary?]

Hello

I have a USB flashdisc which is my drive J:

I just tried to copy to an external drive, since I want to reformat J:

Now; before copying, I got the following information when I chose "Properties" on J:

Used Space: 656 572 416 byte

Free Space: 366 952 448 byte

Capacity: 1 023 524 864 byte

The copy procedure went ok. No errors.

When I choose "Properties" on the J: folder on the external drive after copying, I get the following numbers:

NB! Please note: I do not know how to translate the text accurately, but the number given to me are:

567 592 343 bytes

585 469 925 bytes

7856 files, 359 folders

Why such a large difference in bytes from source to destination? Have files been lost?