Jump to content

Defragment takes too long on exFAT external drive


Recommended Posts

Hello everyone,

I've read some similar posts but no one was on exFAT file system, so I've decided to create a new topic.

I have a 1TB 5200rpm external HDD, file system is exFAT. Today I decided to defrag it with ccleaner defraggler since my drive didn't show up on built-in windows defrag menu.

It started defragging, it immediately raised to 33% and now its moving extremely slow. After 6 hours its now 37% completed. Says its >1 Days to complete. On task manager, defraggler using 0.2MB/s disk. (I don't know if this is misleading information, since my drive is an external drive.)

  • Analysis results:
  • 4 Fragmented Files(91,3GB)
  • 60 Total fragments 
  • %12 Fragmentation

I read that windows doesn't let it use cache on USB 3.0 and it might be useful on USB 2.0. Should I wait? and is it safe to stop the defragment now and try USB 2.0 or other things and start over?



Link to comment
Share on other sites

  • Moderators

Stopping a defrag doesn't destroy data since all defrag software is using the Microsoft Defrag API in the background which is relatively safe.

You state the built-in Windows Disk Optimizer won't let you defrag the drive, that's just the GUI interface that stops you from defragmenting certain file systems or drive types (such as it won't let you defrag a USB Flash Drive), whereas via an admin Command Prompt you can use the command line defrag regardless of disk type or file system that's supported by Windows, I use it all the time.

Here's a search for "Windows 10 Command Line Defrag":

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.