Direct-to-disk recording


Direct-to-disk recording

Direct-to-disk recording (DDR) refers to methods by which analog signals and digital signals such as digital audio and digital video are digitally recorded to optical disc recording technologies such as DVDs, and CD optical discs . Magnetic storage includes hard drives (HDD), magnetic tape such as video tape and is different than flash memory.

Generally these devices have the ability to convert analog signals into computer files.

Direct to disk can involve permanent or semi-permanent non-volatile memory recording media. Computer hard disk drives are random access, erasable and rewritable non-volatile recording devices but have been referred to as "permanent" by some manufacturers of direct to disk systems.

Contents

Audio recording

In 1982, New England Digital offered an optional hard disk recorder package for their Synclavier which allowed digital recording of monophonic 16-bit 50 kHz audio direct to a hard drive. This was the first digital direct to disk audio recorder available commercially.[1] Stereo audio was not immediately available due to data input and output limitations on hard drives of that time.

Today, a majority of digital audio recording is preserved on hard disk drives.

Video recording

Consumer

Professional portable

  • Professional recording equipment using DtD transfers is beginning to appear. In April 2006, Seagate announced the first professional Direct-To-Disc cinematic camera aimed at the independent film-maker (using their disc drives).[3]
  • Infinity Series by Grass Valley
    • Infinity Digital Media Camcorder – Infinity Digital Media Recorder
    • REV PRO Digital Media Drive-REV PRO Removable Media

Professional studio

  • The Media Pool (1994)- Disk Recorder by Broadcast Television Systems Inc. (BTS) was the first[4] Professional Studio DDR. Received the Outstanding Achievement in Technical/Engineering Development Awards from National Academy Of Television Arts And Sciences in 2000–2001 for Pioneering developments in shared video-data storage systems for use in television video servers - Philips/Thomson.
  • Profile from Tektronix Models: PDR200-(1996), PDR300, PDR400
  • Quantel:
    • sQ Class of Servers and sQ Clients
  • Grande Vitesse Systems (GVS):
    • Profile GVS9000 2XU Pro, GVS9000 1XU Pro, GVS90000 7XU and other models of DDRs
    • Nomadic 1U 12xPro 24 hrs Uncompressed 10-bit 1080p Media Storage
    • Metropolis Media Servers
    • 9000CTR Dual Uncompressed HD Controller
  • Grass Valley:
    • Profile PVS3000, PVS3500 and other models of DDRs
    • K2 Media Servers and Media Clients
    • Profile XP Video Servers
    • Profile XP Open SAN System
    • M-Series intelligent video digital recorder (iVDR)
    • Turbo intelligent digital disk recorders (iDDRs)
  • Rave/SpectSoft
    • RaveHD
    • Rave2K
  • The Digital video is stored on a storage area network (SAN) hard disk array.
    • Each year hard disk storage capacity gets larger and is able to hold hours of movies on Tera Byte systems.

Advantages of DDR over tape

  • Quicker into the non-linear editing systems: no need to digitise
  • The hard disks can store more than most video tapes
  • Tapes and VTRs are expensive to maintain for the higher video data rates

Disadvantages of DDR over tape

  • Hard disks are more expensive than video tapes
  • Hard disks fail more frequently than video tapes
  • Not practical to store a bank of hard drives for long term video storage.

See also

References


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