Yes. "Formatting" implies removing any partitions from the drive.
Use Disk Utility to format or partition hard drives. You should back up the drive before formatting or partitioning.
Modern disk drive construction more or less requires drives to have at least one partition. Whether the drive is internal or external is immaterial.
If they are on separate hard drives you can generally just delete/format the hard drive with the OS that you do not wish to keep. If they are on separate partitions on the same hard drive you may have to reinstall the bootloader after deleting/formatting the partition.
Your question isn't exactly clear. If you want to install Ubuntu natively onto a partition, you must format the partition or make a new one. It is quite possible to resize the XP partition and make a new one without losing data on the XP partition. Ubuntu already includes the tools to do this.
Logical Drives
Windows doesn't support partitioned USB Drives. By default, formatting such a device under Windows will create a single partition utilizing the total space of the disk. There are some utilities which may allow the creation of multiple partitions, but it is not recommended, or supported.
Of course you need to partition your drive. If you already have installed Windows XP You need to make a new partition for win98 formated FAT32. WinXP use NTFS formatting.
Partition and format the drive. However, if you will be installing an operating system onto this hard drive, the install routine of most modern operating systems will perform the partitioning and formatting automatically.
Because A and B are reserved for floppy drives.
A map to the partitions on the hard drive. This table tells BIOS how many partitions the drive has and how each partitions is divided into one or more logical drives, which partition contains the drive to be used for booting (called the active partition), and where each logical drive begins and ends.1-map to the partitions on on the hard drive2-information about where each logical drive is located, where it starts and where it ends3-which partition contains the drive to be used for booting (the active partition)The first is a map to the partitions on the harddrive,and how they are divided, the second, which partition contains the drive to be used for booting this is called the "Active Partition", and third where each logical begin and ends.
The computer management feature in Windows can be used to partition a drive and create logical drives within these partitions. There are also commercial and non-commercial programs available for the same purpose.
You can'tassigntwo different drives the same letter. If you are having an hard drive or hard disk then you can make different partition and then assign each partition differently, but can not assign same letter for two or more drives.