ASUS ZenDrive U9M (SDRW-08U9M-U) External DVD Writer Optical Drive

The maximum speed at which an optical drive can read data from a CD, DVD or Blu‑ray disc, expressed as a multiplier of the standard base speed (e.g., 24×). This value indicates how quickly the drive can retrieve information for playback or copying.

The average time required for a CD‑ROM drive to locate and read data on the disc, expressed in milliseconds (ms). This metric indicates how quickly the drive can access information during operation. It is useful for comparing performance across optical drives of the same or different models.

Indicates the mechanical configuration used to load optical discs into a drive, such as tray‑loaded, slot‑loaded, front‑loading or top‑loading. This attribute helps users understand how the device accepts media and can influence compatibility with different disc formats.

The average time taken by a DVD drive to locate and access data on the disc, expressed in milliseconds. It indicates how quickly the drive can begin reading or writing after a command is issued, affecting overall performance for media playback and disk operations.

The maximum write speed of a DVD+R double‑layer optical disc, expressed as a multiplier (e.g., 6x, 8x). This value indicates how many times faster the drive can write compared to the base speed of a standard single‑layer DVD. It helps users compare the performance of different drives and choose one that meets their recording time requirements.

The physical diameter of an optical disc, expressed in a length unit such as millimetres or inches. This measurement indicates the size of the media that can be used with compatible drives and helps users verify compatibility with devices and storage cases.

The maximum number of input/output operations per second that a storage device can perform when writing data randomly, typically measured with a 4‑KB block size. This metric indicates how quickly the device can handle small, non‑sequential write requests and is useful for evaluating performance in database or high‑transaction workloads.