While using Drive Genius 3 to partition an eSATA drive for use with Time Machine, I noticed that the drive contained three tiny partitions which were not visible in Disk Utility. One is an "EFI System Partition" named "disk5s1" and is about 210 MB in size. I've seen names like this in Disk Utility when first installing and formatting drives in my eSATA enclosure. The other partitions, named "Free space #1" and "Free space #2", are "Apple_Free" partitions and are 3KB and 132MB respectively. What's up with these partitions? Not that they take much space on a 2TB drive, but can they be deleted?