Computer Memory and Storage

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.