What is the data capacity of a dual-layer Blu-ray disc (BD)?

• A. 25GB
• B. 50GB
• C. 4.7GB
• D. 700MB

Answer: (B)

A dual-layer Blu-ray disc has a data capacity of 50GB. This larger storage capacity is made possible by the dual-layer technology that allows for two layers of data to be written on the disc, effectively doubling the storage compared to a single-layer Blu-ray disc, which holds 25GB.

Blu-ray discs are designed for high-definition video storage and can also accommodate high-data rate applications, which is critical for gaming, HD video, and other data-intensive usage. This makes dual-layer Blu-ray discs ideal for delivering full-length films in high definition, multi-angled content, or additional features such as behind-the-scenes footage and alternate scenes due to their increased capacity.

Other options present significantly lower capacities that do not apply to Blu-ray technology specifically: standard DVDs typically hold 4.7GB for a single layer and 8.5GB for a dual layer, while CD-ROMs hold about 700MB. Therefore, the dual-layer Blu-ray disc's ability to hold 50GB makes it suitable for modern high-capacity storage needs.