The disk was again divided into 40 tracks, but now it had 16 sectors per track, for a total of 160K. This followed the Texas Instruments specifications for Double-Density, a standard that was ignored for all third-party controllers except the ones from Myarc.
It would also format in Single-Sided, Double-Density (SSDD) mode. Data was written to the disk using the FM method to separate data and timing signals, placing the timing data between the data sectors. The disks would then have 40 tracks of 9 sectors each on each side of the disk, for a total of 180K per disk. This system could be extended to be used to format Double-Sided, Single-Density (DSSD) disks. It would format in Single-Sided, Single-Density (SSSD) by dividing one side of the disk into 40 tracks of 9 sectors each, for a total of 90K per disk. It had two Single-Density and two Double-Density formatting modes. This card allowed several different formatting options using the Disk Manager 3 cartridge. Between 10 and 30 examples of this card are known to exist within the TI community. Almost all known examples exhibit stability problems due to overheating of the voltage regulator chip unless a high-quality heat sink is installed (this was not included in the original design or the parts kit). The card was designed to use a 765 floppy controller chip. The TI Double-Density Floppy Disk Controller Card was released as a build-it-yourself kit to the members of the engineering department at Dallas (and possibly at other locations). Double-Density Floppy Disk Controller Card
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