How to delete unused, no drive letter assigned, partitions in Windows 8.1 Pro

Hi,
My drive partitions are assigned as below within "Computer Management" > "Disk Management":
(screenshot not allowed from my account, for some reason).
Volume   Layout    Type    File System    Status                            
Capacity              FreeSpace    %Free
<blank> Simple     Basic   <blank>        Healthy(Recovery Part.)    300MB               
300MB        100%
<blank> Simple     Basic   <blank>        Healthy(Recovery Part.)    99MB                 
99MB          100%
3TB (E:)  Simple     Basic     NTFS            Healthy(Recovery Part.)   3000 GB             
2000 GB      81%
SSD(C:)  Simple     Basic     NTFS           Healthy(Recovery Part.)     465 GB             
78 GB       17%
I want to remove/delete the 2 partitions, Recovery Partition & EFI System Partition, to the left of the C: Partition on Disk 1.
However when I right click on either partition I'm unable to do anything ("Recovery" only shows help in right click menu, "EFI System" shows full right click menu however everything but the help option is greyed out).
I've also looked around and tried the diskpart command from an Administrative command line. However having tried:
>diskpart
>rescan
>list disk
I can only see the 2 main partitions (3TB/SSD) on both Disc 0 & 1. Leaving me unable to assign drive letters/delete/etc.
Help !

Hi,
Why do you want to delete the two partitions?
Actually, they are not unused, they are managed by PC. Each bootable drive must contain an ESP. The computer will boot to the Extensible Firmware Interface System Partition (EFI System Partition, or ESP).
The recovery partition is  Windows RE tools partition.
Alex Zhao
TechNet Community Support

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