Computer Memory and Storage

In a typical computer operation, RAM is used as almost all data is passed through OS for fast retrieval.

Average seek time is the time required to by read head of disk to move from one cylinder of HDD to another.

DIMMs need to be refreshed in order to retain the content with regular interval.

Magnetic tapes are mounted on reels. Tapes need to move on reels in order to access particular memory locations on it.

Cache memories are smaller than RAM, as most of the time the data is retrieved from RAM itself. RAM is comparatively faster than ROM in terms of data retrieval.

Semiconductor memories have fastest access time because they contain data in terms of bits and return directly to binary values. Hence, they are used for registers.

Virtual storage, or virtual memory, is a memory management technique where secondary memory can be addressed as if it were part of the main memory. Operating systems load only the active pages of a program into primary storage, bringing in other pages as needed.

A sequence of microinstructions that defines the execution of a machine instruction is known as a microprogram or micro-sequence.

In floppy disks, the index hole is a physical hole used by the disk drive to detect the start of the first sector on the disk.

The kernel is the core component of an operating system that manages system resources, including memory allocation and CPU scheduling.

Cache memory is high-speed memory placed between the CPU and main memory to reduce the time it takes to access data.

A card cage is a mechanical frame or enclosure designed to hold and support multiple printed circuit boards. It provides the physical structure and electrical connections for the cards.

Base and bound registers are hardware components used in memory management to define the address space of a process. They ensure that a program accesses only its allocated memory, which is essential for virtual memory and protection.

ROM stands for Read-Only Memory. As the name implies, its contents are permanently written during manufacturing and cannot be altered by normal write operations.

Latency, specifically rotational latency, is the time it takes for the desired data on a disk to rotate under the read/write head. Access time is the sum of seek time and latency.