A disk “partition” is just a logical slice of a hard drive. Logical means that you still only have a single drive but it is virtually cut into pieces so that if one partition has a problem, the whole disk will not fail.
Let’s look at each of the different partitions you are likely to see on a hard drive running Windows 10 or Windows Server:
The Recovery Partition is a a very small amount of hard drive space that contains a limited set of Windows 10 installation files and a very stripped down interface called the Windows Recovery Environment (aka WinRE). It is only used when the system detects corruption on the hard drive.
Yes, but generally you should not delete the Recovery Partition because:
Every time Windows upgrades to a new version (twice per year as of 2020), the upgrade process will evaluate the empty space in your Recovery Partition and determine if there is enough space for it to add the new recovery files. If there is not enough free space the Window 10 upgrade process will automatically shrink your Primary Partition, create a new Recovery Partition and add its files there.
Yes, old recovery partitions can safely be deleted as they are being ignored by the system and just wasting space. The recovery partition furthest to the immediate RIGHT of your Primary Partition (i.e. C:\) is the active one and all others can be safely deleted.
A Windows 10 System Partition is the place where “boot” files are stored including the Windows Boot Manager, Boot Configuration Data (BCD) Store and if your hard drive is encrypted the System Partition is where encryption information is stored.
No, definitely not. If you were to remove the System Partition, your data files would NOT be lost but you would no longer be able to boot (start up) the operating system.
M.S.R. is an acronym for “Microsoft Reserved” and it is the place Microsoft leaves as a safety valve for future use. If Windows disk management tools detect problems with parts of your physical hard drive storage, it will use move the data from the damaged parts of the disk to a the MSR area.
Note that while the vast majority of Windows 10 computers will have an MSR partition, some will not. MSR only appears on GPT formatted UEFI systems.
Yes, in most situations the MSR Partition it can be deleted. However you should not delete the Recovery Partition because:
The Primary Partition on a Windows 10 PC is is the drive space you see when you look in COMPUTER / FILE EXPLORER which almost everyone has configured with drive letter C:\ .
No, definitely not. If you were to remove the Primary Partition, your data files, the operating system and all your programs would be lost.
A RAW partition is a one that the current operating system does not recognize. You can often see problems with RAW disk when something terrible has happened to the file system and so you might want to use a utility to fix RAW partition.
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