It honestly depends. There are two ways of erasing data on a hard drive: either delete the file on the hard drive which points to where all the data is, or change every bit in the hard drive to a 0 (the latter takes longer).
If the former has been done, data can be recovered using specialist software. If every bit was changed to 0, the data itself has literally been changed and CANNOT be recovered.
If data has been corrupted (files deleted/missing) to the point where your Windows system doesn’t boot, you *may* be able to recover the data on the disc if the only thing that was damaged were the Windows boot files.
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