Direct-to-disk recording

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This article is about digital storage systems. For analog audio recording/mastering, see Direct-to-disc recording.
Not to be confused with Digital video recorder.

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 videotape and is different from 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.

Audio recording[edit]

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[edit]


Professional portable[edit]

  • 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 filmmaker (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[edit]

Advantages of DDR over tape[edit]

  • 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[edit]

  • 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[edit]


  1. ^ Synclavier history
  2. ^ "JVC Everio series hard disc handi-cams". JVC. Archived from the original on 2006-09-29. Retrieved 2006-11-22. 
  3. ^ "Seagate Hard Drives Enable World's First Digital Cinema Camera With Direct-To-Disc. Recording" (Press release). Seagate. March 2005. Retrieved 2006-11-22. 
  4. ^ "Media Pool tests the tapeless waters. (BTS digital disk-based recorder)". Archived from the original on 2007-10-04. Retrieved 2008-01-27.