DVD ROM Combo Drives And Other Storage Devices

Objectives :

  • Explain the data arrangement in a DVD
  • List the types of constructional formats of DVDs
  • List the types of DVDs
  • Explain the working of the DVD drive
  • Explain the parts of the DVD drive
  • Identify the speed listings of DVD drives
  • Install the DVD drive
  • Configure the DVD drive
  • Identify combo drives
  • Troubleshoot the DVD drive
  • Explain the other storage devices

Data Arrangement in DVD :

Data is arranged in a spiral manner

Data is recorded outwards from the center

Each data track is made of millions of data pits

Data pits are incredibly tiny and measured in nanometer

Basic composition of the DVD is made of :

  • Polycarbonate plastic – plastic layers are arranged to form a spiral track
  • Thin reflective layer - Covers the plastic layer. The reflective layers cover the surface of the disk
  • Lacquer - All the layers of plastic are joined together with lacquer

Constructional Formats of DVD :

DVD can hold data on single or both the sides

Single-sided single-layered DVD is also known as DVD-5 and has capacity of 4.7 GB

Single-sided dual-layered DVD is also known as DVD-9 and has capacity of 8.5 GB

Double-sided single-layered DVD is also known as DVD-10 and has capacity of 9.4 GB

Double-sided dual-layered DVD is also known as DVD-18 and has a capacity of 17 GB. Provides eight hours of audio or video playback

Types of DVD :


DVD-ROM - Stores films, computer software in capacity ranging from 4.7 GB to 17 GB

DVD-Video - Stores movies and requires DVD drives with MPEG-2 decoder

DVD-Audio - Stores high-quality music and can also store video content and slide shows

DVD-R and DVD+R - Can be written only once. An organic dye coats the layer of these types of disks

DVD-RW and DVD+RW - Known as phase-change disks

DVD-RAM - Can be accessed in the same manner as a hard drive or floppy disk

DVD-VR and DVD+VR - Used for the creation of movies that can be edited

HD-DVD – Known as Advanced Optical Disc

Working of the DVD Drive :

Tracking system of the DVD player consists of tracking motor and spindle motor

DVD drive reads the data from DVDs with the help of a laser assembly

Laser beam reads the data on the DVD

Laser beam focuses on the reflecting layer of the DVD

Laser is reflected off the reflective layer onto a photosensitive receptor

Photosensitive receptor studies the reflected signal for changes in reflection

The data is then sent to the intended device directly or through a DAC

Difference between DVD and CD :

Pits and lands used by DVD are much smaller than those used by CD

In DVD the pit length is 2.25 times smaller

The track pitch is reduced by 2.16 times

DVD has slightly larger data area on the disc

In DVD the error correction code is 1.32 times more efficient compared to CD

In DVD the sector overhead is less by 1.06 times

DVD drives and specifications :

DVD drive speed – DVDs rotates counterclockwise and are recorded at a constant data rate called Constant Linear Velocity (CLV) e.g. 4x/24x

Interface – Physical connection of the drive to the PC’s expansion bus e.g. ATAPI, USB

Loading mechanism – Tray, caddy and slot are three distinctly different mechanisms for loading a disc into a DVD drive

DVD ROM Drives :

Read-only drives, cannot write or record information on a DVD

Speed of the DVD ROM drive is indicated by a number followed by an x

DVD-ROM drives can have two to three speeds listed


Structure of the DVD ROM Drive :

Front panel of the DVD ROM drive has a tray that accepts the DVD

Back panel of the DVD player has different ports for the connecting the DVD drive to the computer

Back panel also includes jumper settings

Jumper connections configures the DVD drive as either master or slave


Other Storage Devices :

Tape drive – Reads the data and write it to a tape. Has large capacity to store data from hundred megabytes to several gigabytes. Tape drives are sequential access devices. DAT drive was introduced by Hewlett Packard and Sony. It is available in either the Digital Data Storage (DDS-1, DDS-2, and DDS-3) format or the DataDAT format.

The different types of tape drives are :

  • 8mm tape drive, DAT drive, DLT drive, QIC

Pen drive – Called as thumb drives due to their small sizes. Storage size ranges from megabytes to gigabytes. Uses the USB standard

ZIP drive – Proprietary product manufactured by Iomega. Hold 1GB or 2 GB of data and are inexpensive and durable compared to floppy disc . One of the most reliable backup devices of magnetic media. Cannot be used as booting device Magnetic coating on the Zip disk is of better quality. Head that reads the information on the disk (cartridge) is small in size. Therefore there is greater number of track per sector on the cartridge and thus more information can be stored. Uses a variable number of sectors per track

Troubleshooting :

Manage the DVD drive properly in order to avoid problems

Troubleshooting the DVD drive is very important, as a faulty drive can damage the DVD

Problem that may occur are :

  • DVD is not playing
  • No power in an external DVD drive
  • No power in an internal DVD drive
  • Tray of the internal DVD drive is not opening
  • DVD drive is running slowly
#DVD_ROM_Combo_Drives_And_Other_Storage_Devices #Data_Arrangement_in_DVD #Constructional_Formats_of_DVD #Types_of_DVD #Difference_between_DVD_and_CD #DVD_drives_and_specifications #DVD_ROM_Drives #Structure_of_the_DVD_ROM_Drive #Other_Storage_Devices #Troubleshooting #DVD_drive_is_running_slowly #Tray_of_the_internal_DVD_drive_is_not_opening #No_power_in_an_internal_DVD_drive #DVD_is_not_playing