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Mike Meyers' CompTIA A+ Guide to Managing and Troubleshooting PCs, Fifth Edition (Exams 220-901 & 220-902), 5th Edition by Mike Meyers

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MBR (master boot record)   Tiny bit of code that takes control of the boot process from the system BIOS.

MCC (memory controller chip)   Chip that handles memory requests from the CPU. Although once a special chip, it has been integrated into the chipset or CPU on modern computers.

MCH (Memory Controller Hub)   Intel-coined name for what is now commonly called the Northbridge.

md (mkdir)   Command in the command-line interface used to create directories.

MDM (mobile device management)   A formalized structure that enables an organization to account for all the different types of devices used to process, store, transmit, and receive organizational data.

measured service   Cloud services are typically billed in small increments based on the computing ...

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