R
Radium
Hi:
Why do hard disc drives use magnetic discs? Why not replace the
magnetic platters with optical ones that use 400 nm lasers to write,
read, erase, and re-write data?
Optical platters using 400 nm lasers would surely have advantages over
magnetic platters. More data per area, and less vulnerability to
environmental magnetic disruptions -- to name a few.
I say dump all magnetic discs and replace them with the optical
equivalent. Use 400 nm laser because 400 nm is the sweet spot between
shortest wavelength and non-ionizing radiation. Shorter wavelengths
require less size to write/read data. Too short and you increase your
risk of cancer. So use 400 nm and dump those useless magnetic discs.
Red lasers -- used by CDs -- are horrible because they require so much
space on the disk to write data. Green lasers -- used by DVDs -- are a
tad better. Blu-ray -- at 405 nm -- is almost at the best wavelength
but not quite!
Regards,
Radium
Why do hard disc drives use magnetic discs? Why not replace the
magnetic platters with optical ones that use 400 nm lasers to write,
read, erase, and re-write data?
Optical platters using 400 nm lasers would surely have advantages over
magnetic platters. More data per area, and less vulnerability to
environmental magnetic disruptions -- to name a few.
I say dump all magnetic discs and replace them with the optical
equivalent. Use 400 nm laser because 400 nm is the sweet spot between
shortest wavelength and non-ionizing radiation. Shorter wavelengths
require less size to write/read data. Too short and you increase your
risk of cancer. So use 400 nm and dump those useless magnetic discs.
Red lasers -- used by CDs -- are horrible because they require so much
space on the disk to write data. Green lasers -- used by DVDs -- are a
tad better. Blu-ray -- at 405 nm -- is almost at the best wavelength
but not quite!
Regards,
Radium