With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Amazon.com sells physical media.
text_B: DVD -LRB- an abbreviation of `` digital versatile disc '' or `` digital video disc '' -RRB- is a digital optical disc storage format invented and developed by Panasonic , Philips , Sony and Toshiba in 1995 .. Panasonic. Panasonic. Philips. Philips. Sony. Sony. Toshiba. Toshiba. digital. digital media. optical disc. optical disc. storage. data storage device. The medium can store any kind of digital data and is widely used for software and other computer files as well as video programs watched using DVD players .. digital. digital media. DVDs offer higher storage capacity than compact discs while having the same dimensions .. storage. data storage device. Pre-recorded DVDs are mass-produced using molding machines that physically stamp data onto the DVD .. molding machines. Injection molding machine. Such discs are a form of DVD-ROM because data can only be read and not written or erased .. ROM. read-only memory. Blank recordable DVD discs -LRB- DVD-R and DVD+R -RRB- can be recorded once using a DVD recorder and then function as a DVD-ROM .. ROM. read-only memory. DVD-R. DVD-R. DVD+R. DVD+R. DVD recorder. Optical disc drive. Rewritable DVDs -LRB- DVD-RW , DVD+RW , and DVD-RAM -RRB- can be recorded and erased many times .. DVD+RW. DVD+RW. DVD-RAM. DVD-RAM. DVD-RW. DVD-RW. DVDs are used in DVD-Video consumer digital video format and in DVD-Audio consumer digital audio format as well as for authoring DVD discs written in a special AVCHD format to hold high definition material -LRB- often in conjunction with AVCHD format camcorders -RRB- .. digital. digital media. DVD-Video. DVD-Video. DVD-Audio. DVD-Audio. AVCHD. AVCHD#AVCHD as distribution format. high definition. High-definition video. DVDs containing other types of information may be referred to as DVD data discs .
related.