Sony DG 90P

Sony DG 90P ... to support smooth tape winding. The cartridge lid is made of strong plastic to protect the tape against accidental drops or mechanical shock.

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.

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.

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.