Storage Devices and Media Quiz

A flash memory card (like an SD card or MicroSD card) is very small and thin, can store large amounts of data, and typically requires a card reader to be read by a computer. A flash memory stick (USB drive) has a built-in USB connector and does not require a separate reader.

DVD-R stands for DVD-Recordable, which can be written to only once by the user. DVD-RW and DVD-RAM are rewritable formats, while DVD-ROM is read-only and cannot be written to by the user at all.

Magnetic storage devices, such as hard disk drives and magnetic tapes, save data by magnetizing particles on a spinning disk or tape. Optical devices use lasers, and solid-state devices use electronic circuits.

Optical storage devices, such as CDs, DVDs, and Blu-ray discs, use a laser beam to read and write data by detecting reflections from pits and lands on the disc surface.

Solid-state storage devices, such as SSDs and USB flash drives, have no moving parts and store data electronically using flash memory. In contrast, optical and magnetic devices rely on spinning discs or moving heads.

CD-ROM (Compact Disc Read-Only Memory) is commercially manufactured with pre-recorded data and cannot be written to or erased by the user. CD-R and CD-RW are designed for users to write their own data.

RAM (Random Access Memory) is volatile memory, meaning it loses its stored data when the power is turned off. ROM, HDD, and SSD are non-volatile storage media that retain data without power.

Compared to Hard Disk Drives (HDDs), Solid State Drives (SSDs) typically offer smaller maximum storage capacities at comparable price points. SSDs are faster, lighter, and more durable, but HDDs remain more cost-effective for extremely large storage capacities.

A flash drive (flashdisk) is significantly smaller and more pocketable than a portable external Solid State Drive, making portability its primary advantage. Portable SSDs, while also portable, are larger but offer much faster speeds and higher capacities.

VHS tapes use serial (sequential) access, meaning you must fast-forward or rewind through the tape to reach a specific point. CDs, DVDs, and SSDs use direct (random) access, allowing immediate retrieval of data from any location.

A Hard Disk Drive (HDD) uses direct (random) access, allowing the read/write head to jump directly to any location on the disk. Magnetic tape and VHS require serial access, where data must be read sequentially from the beginning.

Serial (or sequential) access requires reading through all preceding data in order to reach a specific target location. Direct access, on the other hand, allows the system to jump directly to the target data.

A flash drive is a solid-state storage device because it uses electronic flash memory with no moving parts. Hard disks, floppy discs, and magnetic tapes are all magnetic storage media.

DVD-ROM is an optical storage medium that uses laser technology to read data. RAM and ROM are semiconductor-based memory, and Micro Flash Memory Cards are solid-state storage.

A floppy disc is a magnetic storage medium that uses a flexible magnetic disk to store data. Compact Discs (CDs), Digital Versatile Discs (DVDs), and Blu-Ray Discs are all optical storage media.

Fixed Hard Disk Drives (HDDs) have the largest storage capacity among the options, often ranging from hundreds of gigabytes to several terabytes. Floppy discs hold only 1.44 MB, while thumb drives and micro flash memory cards typically hold much less than a typical desktop HDD.

A CD-R typically holds only about 700 MB of data. This is much smaller than Blu-Ray discs (25 GB to 50 GB), and vastly smaller than Hard Disk Drives or Solid State Drives, which routinely store hundreds of gigabytes or terabytes.

Magnetic, solid-state, and optical storage media are all widely used and mature technologies. 'Liquid' storage is not a standard commercial storage medium, making it the correct choice.

Physically breaking the storage media destroys the physical components where data is recorded, leading to permanent data loss. While heat from the sun can damage some media, physical breakage is a direct and guaranteed cause of total data loss.

DVD-RAM is a disc format that allows simultaneous reading and writing. This feature makes it highly suitable for real-time video recording devices, such as camcorders and DVD recorders, allowing users to watch a recorded segment while still recording.

Blu-ray discs have a high storage capacity (typically 25 GB to 50 GB), which is necessary to store the large file sizes of high-definition (HD) movies. CDs and DVDs do not have enough capacity to store full-length HD films.

Among the listed optical storage media, Blu-ray has the highest storage capacity (starting at 25 GB for single-layer). In comparison, DVDs hold up to 8.5 GB (dual-layer) and CDs hold around 700 MB.

Compact Discs (CDs) are the traditional and most appropriate optical medium for standard or lower-quality audio files, as they offer sufficient capacity (700 MB) without the unnecessary expense of high-capacity media like DVDs or Blu-ray.

Standard definition (SD) television video typically requires about 1.5 to 2 GB of storage per hour. Therefore, a 25 GB Blu-ray disc can store approximately 13 hours of SD content (25 GB / ~1.9 GB/hour = ~13 hours).

To find the number of files, convert the storage capacity to the same unit as the files. Since 4 GB is equal to 4,000 MB, dividing 4,000 MB by 4 MB per file gives exactly 1,000 files.

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.

Memory sticks use solid-state flash memory, which has no moving parts. This makes them highly durable and resistant to physical shocks compared to mechanical hard drives.

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.

Magnetic tapes have very high storage capacities, allowing an entire server backup to be stored on a single tape. Their slow access times and sequential nature are disadvantages, not advantages.

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.

Backing up data to an online server over the internet is known as a remote backup, as the backup destination is physically located away from the source system.

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.

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.

A system image is an exact copy of an entire drive partition, capturing all files, system settings, and the operating system. This serves as a structured alternative to manually copying individual files.

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.