Computer Memory and Storage

A CD-R is a recordable optical disc that allows users to manually write and store files. RAM and ROM are system memory types that cannot be used for external file backups, and CD-ROMs are read-only from the factory.

An incremental backup only copies the files that have changed since the last backup was performed, adding these changes to the existing full system backup to save time and storage.

A complete system backup (or system image) captures the entire state of the computer, including the operating system, settings, programs, and all user files, allowing for full recovery.

Personal documents, photos, and videos are unique and completely irreplaceable if lost. Operating systems, program files, and utilities can easily be reinstalled from original installation media or online downloads.

Data corruption occurs when files become unreadable or altered due to software bugs, hardware failures, or power outages. Regular backups ensure that clean, uncorrupted versions of files can be restored.

Solid state drives (SSDs) offer faster access speeds, lower power consumption, and have no moving parts compared to traditional magnetic hard disk drives (HDDs). However, SSDs are generally more expensive per gigabyte of storage than HDDs. Therefore, being cheaper is not an advantage of an SSD.

Cache memory is built directly into or very close to the CPU chip and uses high-speed static RAM (SRAM). This allows it to be accessed much faster than main memory (RAM), which uses slower dynamic RAM (DRAM). Cache holds frequently used instructions to speed up processing.

CPU performance is directly influenced by clock speed, the number of processor cores, and the size of the cache memory. The capacity of secondary storage (like a hard drive or SSD) determines how much data you can save, but it does not affect the processing speed of the CPU itself.

CD-ROM, DVD-ROM, and CD-RW are all forms of optical storage media that use lasers to read or write data. A flash drive, on the other hand, uses solid-state flash memory to store data, making it the odd one out.

Secondary storage devices, such as hard drives and solid-state drives, are non-volatile storage media that are not directly accessed by the CPU. Instead, data must first be copied from secondary storage into primary storage (RAM) before the CPU can read or execute it.

RAM (Random Access Memory) is volatile memory, which means it requires electrical power to maintain its data. When the computer is powered off, everything stored in RAM is lost. Non-volatile memory, such as ROM or a hard drive, retains its data even without power.

Lossless compression retains all of the original data, allowing the file to be reconstructed perfectly with no loss in quality. Lossy compression permanently discards some data to achieve smaller file sizes, which can degrade the quality of the file.

ROM stands for Read-Only Memory, which is a type of non-volatile storage used in computers and other electronic devices. Data stored in ROM cannot be easily modified or written to, hence the term read-only.

CPU registers are small, high-speed storage locations within the CPU itself that are used to temporarily hold data, instructions, and the immediate results of calculations during processing.

Degaussing uses a powerful magnetic field to disrupt the magnetic domains on a hard drive, completely destroying the data and making the drive unusable. While physical destruction like drilling is also used, formatting and defragging do not securely erase confidential data.