I had a drive which was only greyed out in disk utility and could not be reactivated. I have described the problem here in more detail. I called LaCie since the drive was still under guarantee and was then talking to a Seagate "specialist" who told me that I may be able to get back all the data and the folder structure with the "Seagate Premium Recovery Suite" program. I installed it and ran it on the drive and was very pleased to see, that it was able to rediscover most of the data. I started the recovering process (copying the files to a different drive). And somehow my target drive got disconnected during the process and then things started to get wonky:

The moment the drive was disconnected, I recognized that the copy process from the Seagate Premium Recovery Software suddenly sped up a lot. Opening About this Mac -> drives I saw my internal Macintosh HD drive filling up quickly (several GB in a few seconds). I recreated the problem, after a restart with no other program running. The exact same result: the moment I disconnect the target drive, I could see my internal Macintosh HD quickly filling up. Quitting the Recovery software immediately stopped the filling up of my internal drive once again.

What I have done so far:

  • restarted my Mac several times
  • resetted NVRAM/NPRAM
  • looked into/cleared files like caches, library, TM snapshots (found nothing "suspicious")
  • deleted the "Premium Recovery Software" and reinstalled it
  • called Seagate again: the assistant and I assumed that the recovery software somehow is still allocating disk space. After he talked to the software team their advice was to either restore to a TM backup or to use a 3rd party tool for disk cleaning

yet for security reasons [they] cannot suggest applications that are not directly supported by Seagate but [I] should be able to find a suitable solution in Mac forums or support

My questions now are:

  • is it likely that the problem is allocated disk space by the recovery software
  • what steps could I further take to clear my disk space (other than restoring from TimeMachine/clean install)
  • Is it just me or is this customer support horrendous in several ways: recommending their own faulty software, then not being able to eradicate the actual problem caused by their program, instead telling my to go online and look for info they should provide

About this drive Other is about 100GB large.

Thank you for any answers.

  • If anyone was wondering what I ended up doing: backed up the system, wipe the drive and use a pen drive with the installer to install the newest version of macOS. Then manually reinstalled my programs and restored the importance data from my TM backup. This way I was able to control what exact software I wanted to have installed. – X_841 Nov 23 '20 at 9:18

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