CD / DVD Rom Information

Optical drives are pretty much a standard part of computer systems these days - they've come a long way from the luxury they were in the mid 90s. The years have also brought new optical technologies beyond just the simple CD, so here is some info on the basic terminology involved in selecting one of these drives:

CD (Compact Disc) - This is the oldest optical format our drives support. It's still the standard for music and small data storage (up to 600-700MB). Every optical drive out there can at the very least read this format.

DVD (Digital Versatile Disc) - This is a format that can store a lot more information than CD, and can support two layers for even more data. It was popularized by movies, as a digital replacement for VHS tapes, but has also caught on as a good format for storing backups and large amounts of data (4GB+ per layer, over 8GB on a dual-layer disc).

Blu-Ray - This is the latest optical format to gain widespread use, and it's most commonly used for high-definition movies. Like DVD it can support multiple layers, with up to 25GB of storage per layer. Blu-ray discs can be used for normal data as well as movies, but the cost of recordable discs is still relatively high compared to CD or DVD.

ROM (Read Only Memory) - This is a term applied to optical drives which can only read discs and cannot write to them. The most basic drives will be labeled as such, or alternatively as a "reader"-type drive (though a reader of one format may still be able to write to others).

RW (Read / Write) - This is the term for drives that can both read and write a given format (or formats), and in more recent times the phrase "burner" has come to have the same meaning.
 Asus 24x DVD-RW SATA (Black)Asus 12x Blu-ray Player SATA (black)Asus 16x Blu-ray Burner SATA (black)
BrandAsus Asus Asus
CD Access Time170 ms160 ms150 ms
DVD Access Time130 ms160 ms160 ms
Buffer Size2MB 8MB
BD Access Time-250 ms180 ms
Capabilities
CD ReadingYes Yes Yes
DVD ReadingYes Yes Yes
CD WritingYes Yes Yes
DVD WritingYes Yes Yes
Dual Layer DVD WritingYes Yes Yes
Blu-Ray ReadingNo Yes Yes
Blu-Ray WritingNo No Yes
LightscribeNo No No
Maximum Speeds
CD Read Speed48x 48x 48x
DVD Read Speed16x 16x 16x
CD Write Speed48x 48x 48x
CD Re-Write Speed24x 24x 24x
DVD Write Speed24x 16x 16x
DVD Re-Write Speed8x 8x 8x
Dual Layer DVD Write Speed8x 8x 8x
Blu-Ray Read Speed-12x 8x
Blu-Ray Write Speed--16x
Blu-Ray Re-Write Speed--2x