Same as on an internal one, delete it in disk manager. Why do you want to delete it?, do you realise that you won't be able to use it without a partition.
A hard drive without a partition is just a paper weight.
Hi, before it use to be my computer main drive with windows vista but I tried to install windows xp but I couldn't sow I tried using it like external hard drive to eliminated the partitions sow I formatted the two partitions hopping I could install windows xp but I cannot eliminated the partitions. Thanks Jonmor68.