Vista - Why did Complete PC Backup format my other drive?

Hi,
I have a dual 500 GB RAID 0 configuration being seen as a 1 TB HD.
On the far left is a 1.5 GB EISA configuration.Which is used for recovery.
Then an unallocated free space of 15 GB which was a partition for a backup.
Then my C:\drive which is 670.75 GB for Vista Ultimate.
Then my D:\ drive which is 244 GB for Data.
Since the 15 GB was too small for my backup I wanted to delete it so I went into Windows setup and deleted both my C:
and the no name 15 GB drives.That is next to the C: on the immediate left side.
When I went to use my Complete PC backup from my D:\drive it said I couldn't cause that was going to be formatted along
with my C:\drive.
Luckily I had another backup on my external HD so I used that.

Why did it have to format my D:\ drive?
This was never in the backup I saved.

Have a good day,
RScotti

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