DVD functions are purely software emulation in firmware. Some DVDs had not enough memory to handle all the specifications in steps, so they only support a few speeds or even limited to +rw writing. The beauty is the ability to fix or improve the software in the DVD provided you have enough memory built in the hardware. External memory can change the DVD functions if hooked into the firmware somehow; however Mandrake did spoil LG cdrw(cdrom) firmware in v9.2?

On battery charging; the technology is still being developed. No matter, if it is alkaline, Nicd, NiMH or lithium batteries; the chemicals had a history(mass deficiency effect or a memory; like the brain cells in human mind; we sleep to recharge our batteries so to speak), and a latent effect. I am still studying the best charging characteristics as we speak.

The fact that particle acceleration helps, and high current discharging removes chemical memory to recharge better; is not characterized by any charger software. So, before fully charged is possible, a discharge cycle is needed then charge again to a full charge that will hold. I am using some of the latest hardware chargers. We will be advising them the newly found techniques. Higher voltage, shorter cycles of low current charging but first discharge to remove chemical memory(determined by charge and voltage rates within a certain tolerance). Most batteries are sensitive to moisture, so hermetic sealing has to be vastly improved(external addition of scotch tape may help). Metal particle size to increase current density must be more uniform to prevent fire. These are just the tip of the iceberg in battery technology.