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Figure 1: An illustration of connecting two drives to a computer to clone one drive (the source drive) to another (the destination) drive. Disk cloning occurs by copying the contents of a drive called the source drive. While called "disk cloning", any type of storage medium that connects to the computer via USB, NVMe or SATA can be cloned. A ...
By June 1983 PC Magazine defined "PC 'clone '" as "a computer [that can] accommodate the user who takes a disk home from an IBM PC, walks across the room, and plugs it into the 'foreign' machine". [7] Demand for the PC by then was so strong that dealers received 60% or less of the inventory they wanted, [8] and many customers purchased clones ...
A cloned drive can replace the original, rather than simply containing backup copies of files. Cloning software replicates the operating system, drives, software and patches of one computer for a variety of purposes, including setting up multiple computers, hard drive upgrades, and system recovery in the event of disk failure or corruption. [10]
The boot loader in or loaded by the MBR displays a menu of logical drives and loads the selected boot loader from the PBR of that drive. An example of a computer with one operating system per storage device is a dual-booting computer that stores Windows on one disk drive and Linux on another disk drive. In this case a multi-booting boot loader ...
Since few programs used BASIC in ROM, clone PC makers left it out; then a computer that failed to boot from a disk would display "No ROM BASIC" and halt (in response to interrupt 18h). Later computers would display a message like "No bootable disk found"; some would prompt for a disk to be inserted and a key to be pressed to retry the boot process.
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On system with BIOS firmware, the BIOS invokes MBR boot code from a hard disk drive at startup. The MBR boot code and the VBR boot code are OS-specific. In Microsoft Windows, the MBR boot code tries to find an active partition (the MBR is only 512 bytes), then executes the VBR boot code of an active partition.
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