It's probably a recovery partition, so you don't want to touch it. Someone can likely confirm or correct me on that, or you could just email Dell tech support about it.
I have a partition in my Disk Management which shows it with no drive letter, and it's FAT, with the Status listed as Healthy (EISA Configuration). Capacity is 39MB with 32MB Free Space, so there's not much there. I have no idea where this partition is, or how to see what's on it. I'm running a Dell XPS Gen 5 with a 160GB ATA HDD Seagate, I think, and a 120GB Maxtor EIDE HDD on a Promise card which I use for backups. Both HDD's are NTFS. Is there any way I can find out where this tiny partition is, and what's on it? I guess it's never been a problem since I never knew it was there. But I think stuff like this just muddies the waters and I'd like to find a way to remove the partition and just make it part of the main partition.