Search results
Results from the WOW.Com Content Network
CD-ROM drives are rated with a speed factor relative to music CDs. If a CD-ROM is read at the same rotational speed as an audio CD, the data transfer rate is 150 Kbyte/s, commonly called "1×" (with constant linear velocity, short "CLV"). At this data rate, the track moves along under the laser spot at about 1.2 m/s.
For the first few years of its existence, the CD was a medium used purely for audio. In 1988, the Yellow Book CD-ROM standard was established by Sony and Philips, which defined a non-volatile optical data computer data storage medium using the same physical format as audio compact discs, readable by a computer with a CD-ROM drive.
For viewing MovieCDs, Sirius recommended a 486 processor or higher, at least 8 MB of RAM, and a 2x-speed CD-ROM drive (most MovieCDs had a data rate of about 280-300 kB/sec). [6] MovieCDs had a running time of about 45 minutes each, so feature films often were stored on two or three discs in one box, and the consumer had to swap discs to watch ...
The lead-out area is not typically directly accessible with consumer DVD-ROM hardware. Furthermore, the key for the security sector is located in the sector's raw header. This header information, unlike the raw headers of CD-ROM disks, is not accessible by default on nearly all DVD-ROM drives.
The program also included over 2000 still images for movies and actors, a large number of sound clips, dialogues and soundtracks, and a smaller selection of full-motion video clips. As the amount of material increased with each new edition, the quality of media tended to decrease, in order to fit everything on a single CD-ROM.
MovieCD, by SIRIUS Publishing, Inc. (1995?), is a format that uses a traditional CD-ROM disc for playback on a Windows PC containing a video file of a movie encoded in a proprietary codec developed by the publisher (the MotionPixels codec, also used in some PC video games in the mid-to-late 1990s), with the disc also containing codec and ...
A protected program can check whether the CD-ROM is original by positioning the drive behind sector 6553 and then reading from it — expecting the Mary version to appear. When a program tries to copy such a CD-ROM, it will miss the twin-sector as the drive skips the second 6553-sector, seeking for sector 6554.
Video CDs comply with the CD-i Bridge format, and are authored using tracks in CD-ROM XA mode. The first track of a VCD is in CD-ROM XA Mode 2 Form 1, and stores metadata and menu information inside an ISO 9660 filesystem. This track may also contain other non-essential files, and is shown by operating systems when loading the disc.