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Windows 7: Will enabling compression when formatting USB drive slow it's writing?

20 Sep 2012   #1
JohnnyScience

Windows 7 64 & Ubuntu 64
 
 
Will enabling compression when formatting USB drive slow it's writing?

I was wondering if enabling compression when formatting a USB drive slow it's writing ability?

I recently did this to a new USB drive & I swear it seems to be taking a lot longer to write/transfer/copy files to it than it should. But it could just be me.


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20 Sep 2012   #2
Maguscreed

Microsoft Community Contributor Award Recipient

Windows 7 x64
 
 

compression, almost by definition trades speed for space.
I would expect a noticeable change when doing it with usb devices.
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20 Sep 2012   #3
JohnnyScience

Windows 7 64 & Ubuntu 64
 
 

Hmm. How much of a benefit do you think it is for a 32g usb drive to have compression on it? Sometimes speed is a much better factor, I'm just not sure how much extra room I'm gaining by having compression enabled on a usb drive?
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20 Sep 2012   #4
Maguscreed

Microsoft Community Contributor Award Recipient

Windows 7 x64
 
 

In part it depends on the file types.
Media files and many image formats are pretty much compressed already.
Especially video streams they're about as compressed as they can get without loss of quality as they are.
Text files, random data files. These get a lot more out of compression.
Stuff with 'space' in it to compress.

There are exceptions, bitmap image files for instance as you may already know are bloated and do take to compression pretty well. Most the current jpeg standards in use are about a 10 to 1 ratio I think to bitmap for data compression.

Anyhow the honest answer is it depends.
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20 Sep 2012   #5
JohnnyScience

Windows 7 64 & Ubuntu 64
 
 

Hmm, is there any way to disable compression without re-formatting the drive?
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20 Sep 2012   #6
strollin

W7 Ult desktop, W8.1 laptop, W7 Home netbook, W8.1 tablet, Win 10 TP VM
 
 

Yes. Just uncheck the "Compress this drive..." box and click "Apply", the files will then be uncompressed. This does assume that the drive isn't so full that there isn't enough room to fit all the files if they are no longer compressed.

Another way to do it would be to copy the files to another drive, they will be copied uncompressed unless you have that drive compressed as well.

With storage space as inexpensive as it is now, I personally wouldn't bother with compression.

Both reading AND writing performance can be effected since the files need to be compressed during writes and uncompressed during reads.

I don't know the particulars of how Win 7 compresses things but back in the DOS days, when disk space was very expensive, MS had something called DriveSpace (also called DoubleSpace) that allowed you to compress your files and save disk space. There were lots of problems with it and many people lost ALL of their data because of it.
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 Will enabling compression when formatting USB drive slow it's writing?




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