I deleted the pseudorandom data files manually and of course I checked with Recuva since I must be sure. But nothing was well because 177588 files where detected by Recuva, almost the same amount as before running Eraser.
Recuva will detect the files created by Eraser and then deleted, of course. But all they are is random data, not private information. It is pretty easy to see which files were generated by Eraser (nonsense file names and folders, or in the root folder) and which create potential privacy/security hazards. Did you find any in the latter category? Are there any personal user files you believed you had erased and which are recoverable (i.e. Recuva has actually recovered them, not that it says it can; in such a case Recuva often provides a preview)? Are there any messages in the Task log which say that such and such a file could not be erased for whatever reason?
I fear there may also be a misunderstanding. Erasing (whatever program does it) does not 'empty' the free space. It simply fills it with files of useless data. That data may be recoverable, but it is still useless. If all that Recuva finds is lots of useless files, Eraser has done its job.
And this raises my security and privacy concerns of course.
But, given what I have said, it should not necessarily do so. Only if specific personal data you wanted to erase or wipe has been recovered is there an issue. And in such circumstances, the Eraser Team will wish to know exactly what happened. Like you, I am a user not a programmer. And in the dozens of experiments I have carried out during beta testing, with a number of versions of Eraser on three different operating systems, I have not had a single case in which I can demonstrate that Eraser, having reported that a task has completed, has failed to destroy data I wanted destroyed.
This is really annoying because first I need a working and reliable program and second wiping the unused disk space of large disks takes awful lot of time. If the result is rubbish what a waste of time.
My experience is that Eraser is
a working program, albeit one that can still be improved. And, if the result is rubbish in the sense I have described, that is in fact the result that users want - private data put permanently beyond recovery.