[TriLUG] OT: the optimum location for inner track/cylinder on rotating media?
Joseph Mack NA3T
jmack at wm7d.net
Thu Aug 13 10:32:11 EDT 2009
On Wed, 12 Aug 2009, Joseph Mack NA3T wrote:
> The test of the theory (that the maximum is not used to
> placate users) would be to measure r for a device that the
> users can't see, like a floppy or hard disk. These should
> all have r=R/2. I can't find any floppies to disassemble.
> and I don't have any dead hard disks
for the floppy disk r=R/2
for the hard disk r=R/3
the floppy fits the theory, while the hard disk doesn't.
This is disturbing.
I now see that all disks have a region at the center of
r=R/3 that isn't used. The vinyl record has a label, The cd
doesn't use the center section at all. The hard and flopyy
disks have a large hub (for the drive mechanism?). In that
case the max area allowed for the constant linear velocity
type platter is pi*R^2(1-1/9) rather than pi*R^2. This
doesn't affect my theory that the optimum location for the
inner cylinder on constant angular velocity platters is
Joseph Mack NA3T EME(B,D), FM05lw North Carolina
jmack (at) wm7d (dot) net - azimuthal equidistant map
generator at http://www.wm7d.net/azproj.shtml
Homepage http://www.austintek.com/ It's GNU/Linux!
More information about the TriLUG