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.
 
There are so many issues with this release. Among this my virtual disk sometimes just disappears and I can no longer even boot into the VM. It still shows up in the actual settings but it doesn't want to boot.
 
with regards to the reported problem above, I was able to solve it by:
0. Created a backup for the VM
1. change back from IDE to SATA 0:1 via the UI
2. prlctl set "Windows 11 MS" --device-set hdd0 --enable

Trim was enabled back then automatically.
 
Also, when creating a new VM, in PD 27 the virtual disk now defaults to IDE 0:0, with apparently no way to make it stick to SATA 0:1 if changing it through the GUI.
 
… BTW, some important features still missing in Parallels Desktop 27 (but let’s hope that they will come, with time…):

- no virtual NVMe disks (as available on Intel PD and UTM);

- no nested virtualisation for Windows 11 guests, in order to run WSL2, etc. (Apple doesn’t support it, yet: but will they ever? are there maybe other possible solutions?);

- no GUI for creating x86 emulated VMs (must still do it through the command line, in PD 27; while it’s easy to do in UTM, where it is integrated into the graphical interface);

- emulation is still very, very slow (only practical for lightweight OSes);

- anything else…?
 
Hello Everyone,

Thank you for your reports regarding the TRIM configuration issue. Please be advised that our Development team is aware of this behavior and is actively working on a fix for a future update.

In the meantime, if you have manually enabled the TRIM option and your virtual machine is no longer bootable (displaying a No Operating System Installed error), please follow the workaround below to restore functionality.

Step 1: Stop and Backup the Virtual Machine:
1. Ensure the virtual machine is completely stopped (Click on the Actions menu on top of the Mac menu bar > Stop).
2. Create a backup of your virtual machine to ensure your data is safe before making changes.

Step 2: Revert the Hard Disk Interface:
1. Right-click the Parallels Desktop icon in your Mac Dock and select Control Center.
2. Right-click your affected virtual machine and select Configure.
3. Navigate to the Hardware tab and select Hard Disk from the left panel.
4. Expand the Advanced settings and change the interface back from IDE to SATA 0:1.

Step 3: Enable the Hard Disk via Terminal
1. Open the Terminal application on your Mac (found in Finder > Applications > Utilities).
2. Execute the following command, making sure to replace "Name of the VM" with the exact name of your virtual machine (please keep the quotation marks):

prlctl set "Name of the VM" --device-set hdd0 --enable

Step 4: Start the Virtual Machine, It should now boot up successfully without the error.

Important Note Regarding This Workaround:
Please be aware that this is a temporary fix for your current session. Once you shut down the virtual machine and fully quit Parallels Desktop, the hard disk interface will automatically revert back to IDE. However, your virtual machine will remain functional and bootable going forward, though the TRIM option will be disabled again.

Lastly, you may subscribe to this article https://kb.parallels.com/en/131168 by clicking on the Get update button so that you are notified once the fix is released.

Thank you!
 
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