Re: assistance with disk ][ and modern 1.2M floppies

[Patrick Schaefer <pa.schaefer@fz-juelich.de>]

Supertimer wrote:

> It was a quality control issue.  SS/SD, SS/DD, and DS/DD
> all use the same magnetic coating.  The difference is that
> they either test a single side or both sides and did density
> testing to see how much the disks can hold.

Okay, but some single-sided disk drives use the lower side of the disk
(opposite to the label) to store the data, other drives used the upper
side. If single-sided means that only one side has been tested, which?

FM uses 1 clock bit and one data bit for each bit of information. For 1
kB of data you will get 2048 bits on disk. MFM doesn't use clock bits,
on the same disk area you can store 2kB.