NTFS
Windows 95 does not have explicit support for SSDs (Solid State Drives). This means it will not perform as well as operating systems that do support them will, and that the drive may wear out prematurely.
Windows Explorer is the file management application in Windows. Windows Explorer can be used to navigate your hard drive and display the contents of the folders and subfolders you use to organize your files on your hard drive.
26 drive letters
Windows 7 and Windows XP are operating systems. You cannot format operating systems. But you can format your hard disk or hard drive. You can use Windows XP bootable CD to format HDD, but you will have to use Windows 7 Bootable Installation disk to install OS on your formatted drive.
yes
Drive 'c' is the hard drive that the operating systems (Windows XP/ Vista/ Win 7 etc) is stored.
FAT32 and NTFS
No. Windows does not (officially) support booting from a USB drive.
NTFS (New Technology File System) is not a specific file. It is a method to organize files on a Windows hard drive.
it either 1,2,3 or 4
The hard drive D: is usually the recovery drive for most Windows operating systems. It's best to stay away from that drive if it is.
Windows XP does not "have" a hard drive. The hard drive is a part of the computer, not Windows XP. Windows XP supports only IDE drives natively, although OEMs can also include drivers to support SATA drives.