Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: this unit is / DVD - CD ?
Document: Works very well for DVD playing, and high quality CD ripping for FLAC files. Speedy and great looking, this puppy has all the requirements for a good drive...except one. It's loud as a grizzly bear awakening from its slumber.
Plextor PX-891SAW Duplication Grade DVD CD Burner Drive - Bulk PackThe PX-891SAW 24X internal DVD/CD Super Multi Writer is Plextor&#8217;s newly improved half-height DVD Writer. The PX-891SAW reads and writes DVD/CD at blazing fast speed of 24X. The PX-891SAW had passed stringent testing procedure to ensure better compatibility of different media brands available today. It also incorporates new improved chassis design to tremendously reduce noise and greatly improve writing quality.
Plextor has been around for a long time - this unit is just another reason why. Nothing special - everything as expected
Back in the late 90's I was frequently building professionally operated computers of the highest quality. Graphics computers, audio recording computers and 5-9 drive CD recording replicators and one thing they all had in common was Plextor optical drives. The king of optical drives.My focus has been elsewhere for about ten years but I've purchased and used countless computers and it seems that everything about them has become so low quality to touch.
I couldn't write a double-layer DVD with it 2 times, both were un-done half-way.I lost 2 double-layer DVDs  for nothing. I think I could have used my old DVD writerwith better results.
I've thoroughly tested it and I can't find anything it won't do that it is supposed to do. Since a DVD can spin up to about 30,000 RPM's I believe a little noise should be expected and comparing the fastest standard like this to a slower spinning 16X isn't really fair anyway.So does it feel cheap? Compared to the old models, yes it does.
I've had many of the drives listed on the Amazon first page. I recommend this one for dependable writes. Liked it so much I bought another for the other optical bay on my Mac Pro4.1.My Sony juke boxes are fussy and read little glitches on 10-15% of the discs I burned with my previous purchases. For the past 6 months using the Plextor, with same Verbatim DVD+R and DVD-DL blanks, I have had no bad burns.
Toast reports 12-14x average and up to 18x current speed during the burn.The Bulk unit here has no accessories. Not a problem for me as I had the mounting screws and the Mac does not need an additional cable. Pop it in [remember to remove the face plate on the tray or the computer's door will jam] and boot up. Mavericks and Windoze 7 recognized the drive without installing drivers.I don't find the noise level particularly high. Not out of line with the previous units.
Works beautifully, a bit more expensive than others. Yes, optical drives may be nearing end of life as a category, but they still serve their purpose and this may be the very last one that I buy. Plextor created a brand-loyal customer with me, oh so many years ago and although this is a non Blu-ray drive, it's exactly what I wanted and needed for a new high-end PC build.
This piece of peripheral is an essential piece to my computer system; replacing an old drive. Manufacturer does offer extended warranty service and ample technical support for anyone to use and/or understand.
Answer: The Plextor PX-891SAW will read from any commercially prepared DVD or CD and with the proper software it will write to almost every type of blank DVD or CD made for that purpose with the exception of a few brands (TDK, for instance, comes to mind as a brand that I could not write data to using a Plextor drive).  It will not read or write to Blu-ray disks.