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Storage Media

DDS

Model Name : DG60P DG90P DGD120P DGD125P DGD150P

 

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Main Features

DDS4 delivers 40GB (compressed) storage in a tiny standard tape Cartridge.

Cleaning Cartridge

DDS lineup--Sony technology makes it possible

A single tiny DDS4 cartridge (DGD150P) holds a massive 20GB of uncompressed data. Key to such high-density storage is Sony's helical scan technology, originally developed for video applications.

Outstanding durability and tape travel stability

Sony's highly durable HCL (High Cross Linkage) binder raises reliability and durability to withstand the stress of repeated use. In addition, Sony's RDP mechanism sandwiches the tape between textured sheets to support smooth tape winding. The cartridge lid is made of strong plastic to protect the tape against accidental drops or mechanical shock.

Unique low torque cartridge

As tape winds onto a reel, torque rises along with diameter. To minimize this torque effect in fast-forward and rewind search modes, Sony uses special designs for the DDS hubs, lower sheet, and lower shell. The shell also improves overall cartridge strength to minimize potential deformation under external stress.

Thin dual-layer coating technology

Sony DDS3 and DDS4 tapes use a dual-layer coating comprising an ultra-thin magnetic layer and a nonmagnetic layer. The ultra-thin magnetic layer provides high output even in the high frequency range essential for high-density recording. The nonmagnetic layer creates a smooth surface to support tape travel stability and durability.

Ultra-fine magnetic particles

Although smaller magnetic particles are more difficult to disperse within the binder, Sony's high dispersion technology achieves outstanding results even with ultra-fine particles. The magnetic particles for DDS3 and DDS4 tapes are approximately 0.1µm (100nm), but the output value for the shortest recorded wavelength is 5dB or higher than that of DDS2.

Main Specifications

  DG60P DG90P DGD120P DGD125P DGD150P
Format DDS1 DDS1 DDS2 DDS3 DDS4
Magnetic Material Metal HDA magnetic body Metal HDA magnetic body HESA magnetic body MP++ MP+++
Recording Density 61 kbpi
(3 kftpmm)
61 kbpi
(3 kftpmm)
61 kbpi
(3 kftpmm)
122 kbpi
(6 kftpmm)
122 kbpi
(6 kftpmm)
Recording Capacity
(Compressed *1)
1.3GB
(2.6GB *1)
2.0GB
(4.0GB *1)
4.0GB
(8.0GB *1)
12.0GB
(24.0GB *1)
20.0GB
(40.0GB *1)
Residual Magnetic Flux Density (mT) 250 250 295 390 400
Coercive Force (kA/m) 121 121 130 190 195
Tape Width (mm) 3.81 3.81 3.81 3.81 3.81
Tape Thickness (µm) 13 9 6.8 6.8 5.6
Tape Length (m) 60 91 120 125 150
Cartridge Dimensions (mm) 73×54×10.5
Product Weight (g) 44 (with case)
Environmental Requirements Operation Conditions (°F(°C);%RH) : 41~113 (5~45 );10~80 *2
Storage Conditions (°F(°C);%RH) : 41~89.6 ( 5~32);20~60 *2
Transportation Conditions (°F(°C);%RH) : -40~113 (-40~45 );5~80 *2

*1 Compression ratio 2:1
The actual capacity, compression ratio and data transfer rate may vary depending on equipment, software usage, environments and data.
1GB= 1 billion bytes

*2 Maximum wet bulb temperature : No condensation at 79°F (26°C).

Drive/media compatibility table

Model Format Drive type
DAT72 DDS-4 DDS-3 DDS-2 DDS-1
DGDAT72 DAT72 Write/Read - - - -
DGD150P DDS-4 Write/Read Write/Read - - -
DGD125P DDS-3 Write/Read Write/Read Write/Read - -
DGD120P DDS-2 - Write/Read Write/Read Write/Read -
DG90P DDS-1 - Write/Read*1 Write/Read Write/Read Write/Read
DG60P DDS-1 - Write/Read*1 Write/Read Write/Read Write/Read

*1 This depends on the drive's specifications. Sony's DDS-4 drive is read and write compatible.

Helical Scan

Helical Scan Technology

DDS4 records 20 gigabytes of data onto a small cartridge (DGD150P), a technology derived from helical scan technologies developed by Sony for video applications. With helical scan recordings, the tape is wound at an angle around the rotary head. Data is recorded on the tape diagonally, not linearly. This method provides ultrahigh-density recording compared to linear recording technologies.