SSDs have no moving parts and offer significantly faster read/write speeds and lower latency compared to HDDs.

Blu-ray discs use blue-violet lasers to read data, allowing for higher data density than DVDs or CDs, typically starting at 25GB per layer.

Flash memory is a type of EEPROM that allows data to be erased and reprogrammed in blocks, serving as the basis for USB flash drives and SSDs.

SSD stands for Solid State Drive, indicating that it uses solid-state components rather than moving parts.

NVMe (Non-Volatile Memory express) is the modern interface protocol designed specifically for high-speed SSDs using the PCIe bus.

RW stands for Read-Write, meaning the disc can be written to and erased multiple times.

Because SSDs lack mechanical moving parts, they are highly resistant to physical impact and vibration compared to magnetic HDDs.

FAT32 and exFAT are widely supported by Windows, macOS, and Linux, making them the standard for USB flash drives.

Seek time in an HDD refers to the time it takes for the mechanical read-write head to physically move over the track on the spinning platter.

Blu-ray discs use a shorter wavelength laser (blue-violet) compared to the red laser used in CDs and DVDs, allowing for smaller pits and greater storage capacity.

HDDs rely on moving parts like spinning platters and read/write heads, making them physically fragile compared to solid-state memory.

The actuator arm is the mechanical part that moves the read/write heads across the surface of the magnetic platters.

Write amplification occurs because flash memory must erase a whole block before writing, leading to extra internal operations and potential wear.

The CD was the first mass-market storage device to use optical technology, utilizing tiny indentations (pits) and flat areas (lands) to encode data.

NVMe was built to communicate directly over the PCI Express bus, overcoming the speed limitations of the legacy SATA interface designed originally for mechanical HDDs.

Wear leveling is an algorithm that distributes data across all NAND cells to ensure no single block is worn out prematurely, extending the drive's life.

SLC stands for Single-Level Cell, referring to flash memory that stores only one bit of data per memory cell, offering higher durability and speed.

Defragmentation is for HDDs to minimize head movement; for SSDs, it is unnecessary and the write cycles used for moving files wear out the flash memory cells.

Magnetic tape remains a cost-effective and highly reliable solution for long-term off-site archival and large-scale data backup in data centers.