Can I safely delete partitions on my MBR drive to convert it to GPT?

Make sure to back up your data before messing with partitions! Regarding your partitions:
- System Reserved and C: are critical, leave those alone.
- The Recovery partition is useful for a reset, and deleting it can hinder recovery options unless you have an external backup.
- As for E:, if you're not sure what it's for, check its contents before deciding to delete it.

It's great that you're looking to switch to GPT for Windows 11! Just a heads up, before making changes to your partitions, always back up your important data. As for the partitions:
- The System Reserved partition is crucial for booting your OS, so don't touch that.
- Your C: Drive holds your OS and files, so definitely leave that alone too.
- The Recovery partition is mainly for factory resets but can be deleted if you have a backup method. The E: partition is a bit of a mystery, but check its content first; if it's empty or not needed, you can likely remove it.

I totally get why you want to convert to GPT! To do this safely, I suggest using a bootable USB drive with the Windows installer. From the installer, go to "Repair my PC" -> "Advanced Troubleshooting" -> command prompt. You’ll be able to run the mbr2gpt conversion commands from there. Just make sure to back everything up first! As for your partitions, definitely keep System Reserved and C:. The Recovery partition you can delete if you’re comfortable providing support some other way.