Linked Questions

14
votes
3answers
39k views

Please explain wasted space on an exFAT formatted external hard drive [duplicate]

I recently bought a 750 GB 2.5" hard drive and put it in an external enclosure. It has Advanced Format Technology (AFT), but I use Windows 7, so I assumed I would be safe. I decided to try exFAT, ...
-1
votes
2answers
394 views

how to find out real data usage of C drive in windows 8.1 [duplicate]

I have a wired issue as in below screen shot. from within C drive, select everything and view from properties, total is around 40GB. however, if i view from "This PC", suppose to see 60GB free, but ...
0
votes
0answers
60 views

SD card has 26gb large “file” [duplicate]

Windirstat shows a large unknown something of 26gb! I have a Samsung 128gb microsd in win10 oct update. I cannot see it in explorer. So I tried to run Ubuntu (from win store) and mounted the sd. $ ...
108
votes
4answers
150k views

What is the difference between “Size” and “Size on disk?”

Looking at the properties for a Windows file I get two attributes, “Size” and “Size on disk,” and "Size on disk" is always larger. What do these two metrics mean?
15
votes
1answer
18k views

Why is exFAT's default allocation size in Windows so high?

Referencing this page: https://support.microsoft.com/en-us/kb/140365 NTFS doesn't go over 4KB cluster size until the volume goes over 16TB, and FAT32 maxes out at 16KB in the 16GB–32GB volume range ...
4
votes
1answer
4k views

Why is “size on disk” much bigger than “size” when I copy data from NTFS to exFAT?

I tried to backup from my NTFS external hard drive to a new exFAT external hard drive. When the copy finished I saw that I have very little free space remained. I checked my file size and I saw that ...
3
votes
2answers
3k views

Same files have different “size on disk” on new drive

I recently bought a 8TB HDD to replace my 1TB drive for storing my backups. However after moving the files to the new drive I noticed they take up a substantially larger amount of space on the disk, ...
1
vote
2answers
2k views

Why does copying 2.46TB to my new 6TB uses 4.26TB?

I bought a 6TB (5.45TB usable) to transfer my 3TB drive. I used robocopy source destination /MIR /R:0 /W:0 /xo Robocopy reports that 2.228TB were copied, but I only have 1.18TB left available out of ...
2
votes
1answer
2k views

Copy file with ADS (Alternate Data Streams) via Network loses hidden streams?

Thanking to this answer https://superuser.com/a/704697/200806 I discovered ADS (Alternate Data Streams) and started to play some demo: created a test.txt:hidden file with hidden in ADS content. I can ...
1
vote
1answer
2k views

Folder Size 18.7gb but Size on disk 1.33TB - why/how could this have happened? Synology DS212 NAS RAID

To start - I am way out of my comfort zone trying to fix this problem but I am not sure what else to do! We have (2) 3TB hard drives in a Synology DS212 NAS RAID and are constantly running into ...
0
votes
1answer
734 views

I know base 2 and base 10 , MB and MiB, but i'm not understanding the byte counts shown for a directory, by du and by windows explorer

The du command shows 43G in use. I'm not sure whether that's base 2 in the sense of 2^30 or if it's base 10, in the sense of 10^9. But anyhow - Running this du command from cygwin, to see the size ...
4
votes
0answers
476 views

Size on disk way bigger than expected

I have read Why is there such a big difference between "Size" and "Size on disk"? but why is mine so different? My RAID5 is set at 128kb stripe, the volume is formatted at 64kb NTFS. I would expect ...
0
votes
1answer
329 views

A file's “space on disk” doesnt match the file's size

I just got a new larger external hard drive and transferred all the files from my old drive to the new one. When I was checking the used space to make sure everything transferred, I found that the ...
1
vote
1answer
190 views

Reverse diff in size between file 'size' and 'size on disk'

I'm aware of relevant previous questions, but I'm seeing the opposite difference. When inspecting a net share, on a windows server, I see a folder with 'Size' ~10x larger than 'Size on disk': What ...
0
votes
0answers
205 views

Strange hard disk information after defrag

I just finished a defrag on one of my drives and I am now getting some bizarre info with regards the available space. I had half written this post titled "Why has defragging used all my disk space" ...

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