[Frank]

And could otherwise knowledgeable people please learn the difference
between disk and disc?

A disk, as in a hard disk drive (HDD) or a floppy (flexible) diskette,
is magnetic.

A disc, as in a CD (Compact Disc), DVD, or BD (Blu-ray Disc), is
optical.

In summary, if it's optical, it's disc. If it's magnetic, then it's
disk.

Thank you and have a good day!

--
Frank, Independent Consultant, New York, NY
[Please remove 'nojunkmail.' from address to reply via e-mail.]
Read Frank's thoughts on HDV at http://www.humanvalues.net/hdv/
[also covers AVCHD (including AVCCAM & NXCAM) and XDCAM EX].