The head doing the reading doesn't care if the platters of a hard drive are reflective, so why are they? I assume it's just a consequence of the way they're made, but how, exactly, is it a consequence?
why are hard drive platters reflective?
Jul 24, 2007
10 Replies
They have to be polished to reduce air turbulence, and maintain a very critical flying height over the surface. How would you do this and have a non reflective surface?
Service to my country? Been there, Done that, and I\'ve got my DD214 to
prove it.
Member of DAV #85.
Michael A. Terrell
Central Florida
Well, that took the fun out of the question! Wouldn't it be more entertaining getting into wavelength and electron orbital?
Did you ever see one explanation for why glass is transparent? The answer boiled down to, "there is no reason it shouldn't be". Huh?
:-)
But you can fly heads on a glass disk which is transparent.
The disk surface is nickel, cobalt and chromium.
Have you ever seen magnetic glass?
Service to my country? Been there, Done that, and I\'ve got my DD214 to
prove it.
Member of DAV #85.
Michael A. Terrell
Central Florida
I'm tired of beating around the bush, so I tuned up the bush hog. Looks like poor little Ferdie was in the way when I fired it up on SED! ;-)
Service to my country? Been there, Done that, and I\'ve got my DD214 to
prove it.
Member of DAV #85.
Michael A. Terrell
Central Florida
Glass disks are used for fly height analysis.
because they are very flat, and the coating is very thin.
Bye. Jasen
Glass disks are metalized to make them magnetic and used in new, high RPM hard drives.
Service to my country? Been there, Done that, and I\'ve got my DD214 to
prove it.
Member of DAV #85.
Michael A. Terrell
Central Florida
My point was the reflective nature of disks is due to the surface materials, not the flatness.
Proof?
Service to my country? Been there, Done that, and I\'ve got my DD214 to
prove it.
Member of DAV #85.
Michael A. Terrell
Central Florida
Join the Discussion
Have something to add? Share your thoughts — no account required.
Didn't find your answer?
Ask the community — no account required