1.    01 Jul 2015 #1
    Join Date : Jun 2015
    Posts : 283
    windows 10 (x64) Home 1709

    Windows...BT and windows.old

    After updating to 10159,
    i have two folders windows...BT which is 3.75 GB and Windows.old, 1.4 GB folders are there.Are they necessary? Because of these I think disk usage has increased.
      My ComputerSystem Spec
  2.    01 Jul 2015 #2
    Join Date : Jan 2015
    Posts : 382
    Windows 10 Home x64

    To delete windows.old right click on start, click run, type "cleanmgr" no quotes click ok. The disk cleanup will come up, select the drive you have W10 installed on, click ok. When the disk cleanup box comes up click on "Clean up system files" the process will repeat itself except this time you can clean up the big files, windows previous installations and another one that escapes me at the moment.

    Those can take up a lot of disk space, as much as, or more than 12G. Since I've been using W10 after each update to the next build I delete those files. The partition I created for W10 is 30G and with an installation and the windows old files it can take 20G+ so I delete it to make room for the next build.
      My ComputersSystem Spec
  3.    01 Jul 2015 #3
    Join Date : Apr 2014
    Space coast of Florida
    Posts : 5,379
    Windows 10 Pro X64 16299.19

    C:\$Windows.~BT is where Windows 10 is installed from when you upgraded to a new build. Not required but the install.esd in the sources folder can be used to create a ISO that can be used to install the same version on other computers using the ESDtoISO tool.

    Windows.old is where your previous Windows installation was saved when you upgraded. If you don't need anything from there you can delete it using Disk Cleanup.
      My ComputersSystem Spec
  4.    01 Jul 2015 #4
    Join Date : Jun 2015
    Posts : 283
    windows 10 (x64) Home 1709
    Thread Starter

    CmmTch, Ztruker
    Thanks to both of you. I have hurriedly put the thread without search After search, I fould the same solution as you have suggested. I could clean up and save nearly 6 Gb space.
    Last edited by lvgandhi; 01 Jul 2015 at 22:11.
      My ComputerSystem Spec
  5.    02 Jul 2015 #5
    Join Date : Jul 2014
    Posts : 10,635
    W10 Insider + Linux

    Once installed .ESD changes to all the files necessary to install windows (same version) again. Instead of converting ESD to ISO i just made ISO with all the files from C:\$Windows.~BT folder and moved to another HDD.
      My ComputersSystem Spec


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