Computer Memory and Storage

Primary storage refers to the main memory of the computer that is directly accessible by the CPU, which is RAM. Hard disks (both fixed and portable) are classified as secondary storage.

CD-RWs use direct (or random) access, allowing the laser to jump directly to any location on the disc to read or write data. This is much faster than serial access, which requires reading through data sequentially.

Magnetic tapes use serial (sequential) access, meaning the tape must physically wind through all preceding data to reach a specific record. This makes access times much slower compared to direct access media.

Blu-ray players are designed to read optical discs and do not typically use flash memory cards as their primary storage or playback medium. Mobile phones, digital video cameras, and MP3 players regularly use flash memory cards to store user data.

The 'R' in CD-R and DVD-R stands for 'Recordable'. This means data can be written (recorded) onto the disc once, after which it can only be read.

DVD-RAM allows simultaneous reading and writing operations, which is highly beneficial for real-time backups and data logging. Other optical formats require separate read and write phases.

Among the options listed, DVD-RAM has the highest capacity, holding up to 9.4 GB on double-sided discs. CD-R and CD-ROM only hold around 700 MB, and standard DVD-RW holds 4.7 GB.

Because portable hard disks are easily moved between different computers, they pose a high risk of transferring malware or viruses from one system to another. The other options describe advantages or incorrect statements.

Fixed internal hard disks are connected directly to the motherboard via high-speed interfaces, giving them very high data access and transfer speeds compared to external or optical media.

In computer storage hierarchy, 1 Terabyte (TB) is equal to 1,024 Gigabytes (GB), which is significantly larger than Megabytes (MB) or Kilobytes (KB).

Storing at least one backup off-site is a fundamental rule of data security. It ensures that if a physical disaster like a fire or flood occurs at the primary location, the backup remains safe.

Cloud computing provides remote storage services, allowing users to save and access files on servers located on the internet rather than on local hardware.

RAID (specifically RAID 1) involves linking two hard drives together so that one automatically mirrors (clones) the other in real-time, providing immediate redundancy.

Mirroring is a common term for RAID 1, where data is written identically to two or more drives simultaneously to prevent data loss in the event of a drive failure.

A software backup uses a dedicated application program to automatically copy files to a backup destination at scheduled intervals, reducing the need for manual user intervention.