sentences:  A virtual disk may emulate any type of physical drive, such as a hard disk drive, tape drive, key drive, floppy drive, CD/DVD/BD/HD DVD, or a network share among others; and of course, since it is not physical, requires a virtual reader device matched to it (see below).An emulated drive is typically created either in RAM for fast read/write access (known as a RAM disk), or on a hard drive.Typical uses of virtual drives include the mounting of disk images of CDs and DVDs, and the mounting of virtual hard disks for the purpose of on-the-fly disk encryption ("OTFE").