Computer Memory and Storage

A 32-bit CPU can address 2^32 bytes of memory, which equals 4,294,967,296 bytes or exactly 4096 MB (4 GB). This is a fundamental limit of 32-bit architecture. The incorrect options (4024MB, 4000MB, 4128MB) are all close but not the correct mathematical value. This is why 32-bit systems cannot utilize more than 4GB of RAM.

RAM (Random Access Memory) allows data to be accessed in constant time regardless of physical location - any memory cell can be accessed directly. CPU processes instructions, ROM is read-only memory, and NIC handles network connections.

In C++, the 'new' keyword is the standard operator for dynamic memory allocation. While malloc and calloc are C functions that can be used in C++, 'new' is the preferred C++ approach because it calls constructors and is type-safe. 'dalloc' is not a standard memory allocation function in C or C++.

On a disk surface, a track is a circular path where data is written. Tracks are concentric circles on the disk platter. Each track is further divided into sectors. A cylinder refers to the set of tracks at the same position on multiple disk surfaces (platters).

When optical media like CDs and DVDs are closed (finalized), they become read-only and cannot be modified or written to again. This makes them immune to virus infection after finalization, provided no infected files were already on them when burned. This is a key advantage of optical media for long-term backups.

DPI stands for Dots Per Inch, a measure of spatial printing or video dot density in digital imaging. It indicates how many individual dots can be placed in a one-inch line.

RAID stands for Redundant Array of Inexpensive Disks, a technology that combines multiple disk drives for improved performance, reliability, and fault tolerance in data storage.

USB stands for Universal Serial Bus, an industry standard for cables, connectors, and communication protocols that connect computers to peripheral devices like keyboards, mice, and storage drives.

NFS stands for Network File System, a distributed file system protocol that allows a user on a client computer to access files over a network much like local storage. It's a fundamental protocol in Unix/Linux networking.

ROM (Read-Only Memory) is called 'read-only' because it contains permanent instructions that cannot be modified or erased under normal operation. Unlike RAM, ROM retains its contents without power and is used to store firmware and critical boot instructions.

A single-layer Blu-ray Disc has a storage capacity of 25 GB. This is significantly higher than DVDs (4.7 GB single-layer) and was one of the key advantages of Blu-ray over HD DVD in the format war.

In Unix-like systems, devices are represented as files in the /dev directory. This allows uniform access to hardware using standard file operations. Directories organize the filesystem, ports are communication endpoints, and 'devices' is circular.

RAID stands for Redundant Array of Inexpensive Disks (though sometimes 'Independent' is used instead of 'Inexpensive'). Option A uses 'Independent' instead of 'Inexpensive,' option B incorrectly uses 'Reverse,' and option D incorrectly adds 'ArrayList.' The most common/original form uses 'Inexpensive.'