Jump to content

Empty MFT om NTFS Drive - how can I delete it?


Recommended Posts

I have nTFS drives that work properly, only whenever I re-boot, the MFT grows HUGE - and it completely empty.

How do i stop that from happening. i have used Revo Uninstaller, it will remove it , but the next time i reboot, the MFT is back to huge again.

Any one got a solution for me - Thank You..

Link to comment
Share on other sites

  • 3 weeks later...

i have seen this happen in past to me aswell
had 1 main partition and 2nd was just random stuff

but i think that 2nd mft is just reserved space, its not in use
and i think (not sure as it was quite long ago), but ithink OS does this when it has no space on system drive


Link to comment
Share on other sites

How big is the volume? - 232 GB

How big is the $MFT? - on disk 3 it is about 19 GB

Have you tried defrafmenting the $mft with Sysinternal's contig? - Yeah, I ran sysinternals, it gets rid of it - but when I reboot it is right back

Is that the System (or Boot) volume or just a data volume? - on the third Data volume



Link to comment
Share on other sites

A tool that is often used to check that size is Sysinternals NTFSinfo.

Example data from a couple volumes of mine (NTFSinfo), same size 320 GB, this is a "system" volume with a zillion little files:

MFT Information
MFT size               : 546 MB (0% of drive)
MFT start cluster      : 786432
MFT zone clusters      : 59059648 - 68687552
MFT zone size          : 37609 MB (12% of drive)
MFT mirror start       : 39070076

And this is a "data only" volume:

MFT size               : 111 MB (0% of drive)
MFT start cluster      : 786432
MFT zone clusters      : 48915648 - 49332416
MFT zone size          : 1628 MB (0% of drive)
MFT mirror start       : 39070076

These are volumes of exactly the same size, on two identical disk drives, used in a very different manner for a few years, you can see the noticeable difference in $MFT size. 

What happened in your case, most probably :dubbio: , is that over time you wrote and deleted on that volume a large number of files, and most (if not all) $MFT defragmenter/cleaners do actually defragment/clean, but they do not "shrink" the $MFT, which remains "of increased size", see:


As files are added to an NTFS file system volume, more entries are added to the MFT and the MFT increases in size. When files are deleted from an NTFS file system volume, their MFT entries are marked as free and may be reused. However, disk space that has been allocated for these entries is not reallocated, and the size of the MFT does not decrease.

AFAIK there is (or was) only a single (BTW commercial) tool from Paragon that allowed to "compact" the $MFT once the entries were emptied/cleaned, see page 21 here:


the tool (or its successors) does not exist anymore: 


but the function is in the hard disk manager:

no idea if the trial of the old thing allows that :unsure::

There are "rumours" that if you fill the disk up to the brim (adding a single or very few very large files), the NTFS will try to reduce the (unused) $MFT areas, but I have no real confirmation.

Since it is only a data volume, it might be worth a try to do that experiment (of course after having made a copy of the data), otherwise it would make sense to copy the data to an external disk, re-format the volume and copy back the data, a 232 GB volume, not completely filled should be all in all a matter of a few hours.

If you want to try the "fill up to the brim" experiment, get the dsfok toolkit:


and use fsz:


3) fsz

fsz can be used to create a file or truncate/extend an existing one.
No file size limits (on NTFS).

Usage: fsz file size (in bytes, no limits - be careful)
Example: fsz data.fil 15773


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
  • Recently Browsing   0 members

    • No registered users viewing this page.
  • Create New...