Advice on confusing (and possibly redundant) partitions after win 10 upgrade

Nov 10, 2015
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My laptop came preinstalled with win 8.1 At that time i had following partitions on my 1 TB HDD - the 400 MB recovey partition, the 260 MB EFI system Partition, the 22.92 GB oem recovery partion (HP) and the C drive
I then partitioned my C drive to give me E and F
I have upgraded to win 10 through windows updates - this resulted in one more recovery partition of 829 MB

Please advise which paprtitions i may delete and earn HDD space

How did the 400 MB recovery partition get there as i have only upgraded only once

PS a .wmi file seems to be the largest file in both the non oem recovery partitions

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