Re: Can I boot into Wubi or at least recover Wubi files when root.disk is 0kb in size
There is the possibility that this is a "new" version of root.disk that is zero-length and an older version still exists on the drive. Since this file existing inside a Windows filesystem, you would do best using Windows data recovery utilities to try to get it back.
Since your data was on a Windows partition, my suggestions are the following:
[NOTE: If your PC has a working copy of MS Windows on it, skip to step 4]
1) Find someone with a working MS Windows PC
2) Remove your drive from this PC.
3) Connect your old drive to the MS Windows PC.
4) Download and install the trial version of RecoverMyFiles from Runtime Software in MS Windows.
5) Right-click the RecoverMyFiles shortcut and select "Run as Administrator"
6) Select the option to Recover a Drive
7) You will get a list of drive, scroll down to find the one for your USB stick or memory card
8) Select Automatic Driver recovery, press Start button
9) It will run for a while but when done, will show a directory tree in the left pane. Do NOT interrupt it.
10) When done, browse the folders in the directory tree -- and be SURE to check the filesizes of the files you want to recover. If the filesize is zero, the file is trashed and you will NOT be able to recover it.
If the files look OK, you will need to contact Runtime Software to purchase a license for the recovery. You won't have to reinstall the app; instead, they will email you an activation code which you can use to turn on the recovery feature.
According to their website, the "standard" version of the app is $70 USD. They also have a Pro version for $99 dollars, but if you go to the website below, you can compare the features and (at least for me) the extra cost wasn't worth it:
Your data ... your money ... your choice.
Ubuntu 15.04 Mate, Mint 17.1; MS Win 8.1, Win10 TP.
Will not respond to PM requests for support -- use the forums.