Supposedly it can be removed, but I wouldn’t trust them to do it correctly or completely.
Hard drives are cheap. Get a new one and clone your existing drive. Swap them, verify your current OS works OK on the new cloned drive. Then “upgrade” to WX. If you don’t like it, wipe the drive and revert to the original, untouched one.
That way you’re absolutely positively guaranteed not even MicroShaft can fubar your existing computer by hubris, incompetence, or simple random chance.
Hard drives are cheap. Get a new one and clone your existing drive. Swap them, verify your current OS works OK on the new cloned drive. Then “upgrade” to WX. If you don’t like it, wipe the drive and revert to the original, untouched one.
That way you’re absolutely positively guaranteed not even MicroShaft (sic) can fubar your existing computer by hubris, incompetence, or simple random chance.
I'd add one additional step: UNPLUG the original drive, making the cloned drive the only HDD the BIOS and Windows sees. That will ensure that the Windows 10 upgrade does not write any boot sector data on the original drive.
Too many people with multi HDD systems often choose the wrong drive in their system's BIOS as their boot drive, and Windows will always look for the first HDD connection it see's to install the OS on. That is not always the first physical drive in BIOS. The result is the boot sector being written on one drive, while the OS is on another.
Yes the computer will boot that way, but it's "messy" especially if the drive with the boot sector on it fails leaving the drive with the OS on it unable to boot.