Laptop BitLocker failing on drive with system compression

4.5

Windows "CompactOS" or system-level compression blocks BitLocker.

Symptoms
  • Error code
  • Process cancels
  • Insufficient space
Possible Causes
  • CompactOS active
  • Low disk space

Step-by-Step Fix

1

Disable CompactOS

Run "compact /compactos:never" in an admin CMD.

2

Enable BitLocker

Encrypt the drive.

3

Re-enable CompactOS

Run "compact /compactos:always" if needed.

When to See a Technician

CompactOS is common on laptops with small (64GB/128GB) SSDs; it must be disabled to encrypt.

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