TRIM functionality (or at least settings dialogue) broken in Parallels 27.0.0

H

howaldoliver

Bit poster
Hello all,

I upgraded from Parallels 26.4.1 to 27.0.0 today and that caused following issues:

1. TRIM got disabled on all my VMs (Windows and Ubuntu).
2. When trying to reenable the TRIM, I'm getting a warning message telling me that I shouldn't enable TRIM because I'm on an HDD. This is not true as I'm on an M5 Pro MacBook Pro which - obviously - has an SSD/flash drive.
3. The advanced menu in the disc section is often not shown properly (not showing line with TRIM at all), requiring me to reopen the settings panel of said VM again.

Host machine:
MacBook Pro M5 Pro 2026, 24gb, 1TB, macOS 26.6.2
Parallels 27.0.0 (58628)

VMs:
Windows 11 TRIM enabled without issues before Parallels upgrade
Ubuntu 26.04 TRIM enabled without issues before Parallels upgrade

I also opened an official ticket with the Parallels support. I would, however, like to know whether anybody else is affected. could anyone confirm?

Thanks in advance,

Oliver
 
UPDATE: It seems to be even worse: As soon as a VM (or its disk) has gone through the erroneous window (clicking "ok" is actually enough), it refuses to boot (showing no OS found). Deleting (while keeping the files) and readding disk is necessary.

Provided Parallels with this information too.
 
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