Emulators are handy for duplicating disk drives or other storage devices, such a critical or frequently accessed CD-ROM that you'd rather copy to your hard drive so you don't have to reinsert the disk every time you need it. KernSafe's TotalMounter is a full-featured emulator that boasts the ability to create and mount most every kind of virtualized drive. It will mount CD and DVD images such as bin, ccd, cdi, iso, mdf, and nrg as virtualized drives that you can "write" to with disk burning software. It also has a full-featured iSCSI Initiator, virtual disk emulator, and INetDisk client. Its network-bridged method can even export entire existing partitions, disks, or CD/DVD-ROMs to clients as a virtual iSCSI device. It conforms fully to iSCSI Standard 1.0.
TotalMounter has a fairly plain interface with old-school text and graphics that recall the pre-GUI days of software. However, the dialog boxes for the program's settings are clear and self explanatory, and there's a good Help file. There's also an up-to-date Initialize and Convert Disk Wizard that you can use to initialize new disks and convert existing basic disks to dynamic disks. These can be used as software-based RAID volumes that can be mirrored, striped, or spanned across multiple disks. The Virtual Write feature is especially nice since it enables you to modify a rewriteable disk image after it's mounted instead of merely creating a static copy.
TotalMounter is freeware that is certified for all versions of Windows from 2000 to Vista, including both 32-bit and 64-bit editions.