The syllable ya at the end of the mantra denotes an offering. Thus the mantra Om Namah Sivaya actually means I offer to Siva a respectful invocation of His Name, and not merely I respectfully invoke His Name. Om Namah Shivaya mantra is sung by devotees in prayers and recited by yogis in meditation.
Short for Short for DVD-Recordable, a recordable DVD format similar to CD-R. A DVD-R can only record data once and then the data becomes permanent on the disc. The disc can not be recorded onto a second time. There also are two additional standards for DVD-R disks: DVD-RG for general use, and DVD-RA for authoring, which is used for mastering DVD video or data and is not typically available to the general public.
DVD-R and DVD+R are two competing recordable DVD formats. DVD-R was introduced in 1997, and DVD+R arrived in 2002. The two formats are incompatible with each other. You can not burn DVD dash discs using DVD+ drives, and vice versa, although dual format burners are available. The developers DVD+R have positioned it as a format superior to DVD-R. The major difference is the addressing system, which refers to the way the laser finds the proper position for data to be written.