
As you can see, there are multiple recovery partitions on my drives.
The store bought PC originally came with a 1 TB HDD (Disk 1). Then, I recently added an Intel 520 SSD 128GB. I migrated the software from the HDD to the SSD and the PC booted without a problem.
I had partitioned the HDD some time ago (before the SSD) into "Windows Drive" (C


After I installed the SSD, I renamed "Windows Drive" to "Old Drive" (O

Which recovery partition can I delete and which one should I keep?
What's the EFI partition?