Two Recovery Partitions
disk3s3 and disk3s6 are both non-default Recovery HDs. I've never seen other sizes than ~650 MB - except after cloning a drive with Carbon Copy Cloner which resulted in a 1.3 GB RecHD partition. 1.3 GB is the size of the uncompressed Base OS X.

To get the system version of the Base OS X do the following:


check with mount that no other volume with the name Recovery HD  is mounted, else: unmount it with diskutil umount /Volumes/Recovery\ HD
mount the first RecHD slice r/o:

diskutil mount readOnly /dev/diskXsY #i.e. disk3s3

get the system version of the "outer" Volume:

grep ProductVersion -a2 /Volumes/Recovery\ HD/com.apple.recovery.boot/SystemVersion.plist 

get the system version of the inner Base OS X System volume

hdiutil mount /Volumes/Recovery\ HD/com.apple.recovery.boot/BaseSystem.dmg
grep ProductVersion -a2 /Volumes/OS\ X\ Base\ System/System/Library/CoreServices/SystemVersion.plist 



Both ProductVersions (outer and inner) should be identical.

Check the content of the volumes:


Recovery HD should contain 3 folders: com.apple.boot.S, com.apple.recovery.boot and System
Base OS X System looks like a normal system volume except /Users is missing and usually invisible folders/links are visible (e.g. /bin or /etc)
Unmount first the Base OS X volume, then the Recovery HD volume.

diskutil umount /Volumes/OS\ X\ Base\ System
diskutil umount /Volumes/Recovery\ HD

Repeat all previous steps with your second Recovery HD:

diskutil mount readOnly /dev/disk3s6
...





Depending on your results (are both Recovery HDs/Base OS Xs legit regarding their folder structure and the inner &amp; outer ProductVersion) and whether the disk contains a bootable system volume at all (probably KickClone), delete one or both slices. If KickClone contains a bootable system, the (succeeding) Recovery HD should have the same system version (ProductVersion) as KickClone (grep ProductVersion -a2 /Volumes/KickClone/System/Library/CoreServices/SystemVersion.plist).

To delete/remove a Recovery HD simply merge it with the preceding partition: