I'm on Windows 11 Pro and found a folder on my C drive with bwfs.bin files numbered up to 106, taking roughly 100 GB. The folder name starts with scan and has a string of letters and numbers. What could be creating it?
What is this folder full of bwfs.bin files taking up 100 GB?
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6th_turn_at_billiards
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On an Acer machine, one possibility is Acer Care Center or Acer Jumpstart. An update problem can reportedly leave behind repeated temporary files, including numbered bwfs.bin files, until they consume a lot of space.
That filename alone doesn't prove which program made the folder, though. Check whether either Acer utility is installed and whether the files come back after cleanup.
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The full folder path would help narrow this down. A scan folder directly under C:\ is different from one buried in an app's data directory. If you share the path, replace your Windows username with a generic placeholder.
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If the drive disappears from BIOS after deleting the folder, treat that as a separate storage problem rather than assuming the files caused it. Avoid changing disk settings at random, and check that your backups are available before troubleshooting further.
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6th_turn_at_billiards:
The computer is an Acer Aspire 3. I've already deleted the folder, so I'll watch for it coming back.