Partition

I am hoping that someone can shed some light on my ??strange partition and offer me some advise.
I have a Pentium 4 computer which came preinstalled with Windows XP Home Edition build 2600 with SP2. 193 usable HD capacity , 2 MB installed memory .
c: NTFS ON DRIVE 0
USB devices (HD)
cf Reader = drive 2
MS Reader = drive 1
SD/mmc Reader = drive 4
SM/xD Reader = drive 3
ST 3200822AS (HARD DRIVE) 200.05 GP = DRIVE 0 .!!!!!
this is my installed external floppy
Today I tried to back up my Hard drive and it told me that the partition failed to back up.
My concern is Drive 0. I have no drive 0 that I can see C:/ shows up as my Local disk DVD-RW Drive =D. Memory stick =F. Sm/xD =H, dvd Drive =E,
Compact Flash =F, sd/MMC =I
Under disk management I see 2 partitions:
Partition 1: under "volume" I see NO letter . It is EISA configuration, Capacity = 6.01 GB with 1.01 GB free space. File system is NTFS. status=healthy
Partition 2: Volume=(C) File system=NTFS, Status=Healthy (System), capacity= 180.30 GB.
I have tried to give as much information as possible. My question is (after all this--sorry)
a)is Drive 0 a normal drive
b) is there is reason that the floppy appears to be installed on the hard drive when I plug it in using an USB port.
c) why will my partiton not back up--could there be another reason?
Sorry for three questions
I would appreciate someone giving me an answer.
Many thanks for your time