Many years ago I formatted my Toshiba External Hard with Ext4 file system (So that it can only open in Linux). It has been working perfectly well ever since. Even right now, it works perfectly well on my Ubuntu 16.01 But I now want to remove the password and change the file system to FAT32 so that I can start accessing it in Windows platforms (Windows 10).
How can I do that without having to format and lose my data. I have quite a lot of data and I don't wanna lose it or transfer it first.
Well, there are two separate problems here:
Being able to unlock the LUKS encryption layer on Windows.
A few years ago, FreeOTFE used to do this quite well. Later it was developed under the LibreCrypt name, although even that seems to have been abandoned.
If you still have Linux, it is possible to decrypt the entire disk in-place:
cryptsetup-reencrypt /dev/sdb1 --decrypt
Being able to access the ext4 filesystem on Windows.
For this you can use the Ext2fsd driver.
If you decide to convert to a native Windows filesystem instead, you'll have to back up everything and reformat the disk. I haven't heard of any tool that could convert from ext4 to FAT or NTFS.
Also, I strongly recommend NTFS (or at least exFAT) over FAT32.
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