Windows 10: Differences in the size of the folders after copy paste, but number of files are the same

Hi there,I just copy pasted a pretty huge folder and here are the stat resultOriginal :size on disk: 2728603648 octetsContent: 1657 files, 345 foldersCopied version :size on disk: 2729814256 octetsContent: 1657 files, 345 foldersWeird! The content is correct, but the exact number of octet differ... Is that something I should worry about?Thank you for your kind help.

:)

 

Java.nio.file - Copying files

You can't copy a folder, thats why it generates an exception (you are trying to copy a folder using a copy file function).
You probably need to list all the files inside that folder and copy one by one

 

Java.nio.file - Copying files

Issue was the above, so thanks temp02.

 

Copying files to my external drive, files totally different sizes, WHY

I have to send my nearly new hp all in one computer in for repairs so I am copying all of my personal files to my Seagate external hard drive. I am using Windows 10 with all latest updates. I am using File Explorer copy/paste function and it takes a couple
hours to complete. After it completes and I use properties to look at the size and number of files and folders, they are totally different. Yet when I go through each folder I can't find anything different, nothing seems to be missing.

The D: drive shows a size 29.9 GB, 9,243 Files and 1,308 Folders

Seagate copy shows a size 13.5 GB, 5,220 Files and 428 Folders

Any ideas why the difference? Am I at risk of losing my data if I erase the D: drive?