What are the shiny CDROM-sized platters in an old desktop disk drive made
I glued two of them together so that the offset covered the center hole to
use as an indestructable traveling shaving mirror.
A friend said they won't pass TSA security but they're not sharp. They are
just really shiny and really flat.
What are they made out of anyway?
I've taken them apart but I didnt' try bending them. If you really
think the tsa will complain, bring another one you can bend for them.
Maybe that will help, if they really do complain. Or bend the double
one you're bringing and use the bent part as a stand.
On Leno tonight, Headlines. someone was photographing a pedestrian,
but he turned his head away and put a file folder between his head and
the camera. Unfortunately the glass window behind him gave a perfect
reflection. Something he might not have known from his vantage
Any HDD I've taken apart I'd be concerned about from a safety
standpoint... the platters don't "bend" at all, and if you try too
forcefully they will explode into a whole mess of tiny, sharp shards.
Good if you're trying to destroy one that you're decommissioning; not
so good if you've packed it with your underwear.
I retract my suggestion.
Did they teach you the word potsherd in high school, or did you read
the word in museums, regarding broken things found at excavations of
For decades my brother and I both pronounced the word pots herd,
until one day I looked at it and realized it was pot sherd.
A bit of a strange choice of material for *traveling* shaving mirror (and
shape, too: how do you hold it while shaving?) - there are plastic mirrors
that are brighter and lighter. You'd think weight would be an important
parameter for a traveler...
But I think TSA should definitely have an issue with you bringing it into
the cabin (why do you need a shaving mirror there anyways? Half the wall
space in a lavatory not enough?) . If it's a ceramic platter, it should be
able to shutter into very sharp shards useful for well, I don't know,
slashing someone's throat to hijack a plane?
Leave it at home.
We must be talking about different things because these two CDROM-sized
mirrors are extremely light - you can barley feel them in your hands. No
mirror I've ever seen in my life is this light. Or as indestructible.
As for traveling, the two platters glued together are really shiny and
extremely light and they don't break when I drop them and they're exactly
the right oblong size (when glued together offset) for a face ... so it's a
PERFECT traveling shaving mirror IMHO.
I've had glass mirrors (which obviously shatter); I've had plastic mirrors
(which scratch too easily and aren't all that reflective; and I've had even
used nicely handled old round concave (or are they convex?)
Japanese-motorcycle mirrors (which eventually broke due to the glass).
Most store-bought mirrors have more "frame" in them than mirror, whereas
these mirrors are 100% mirror without any frame or handle to have to carry.
Many store-bought mirrors come apart after repeated use in the shower (I
always shave in the shower).
So far, I can't think of a more perfect traveling shower-shaving mirror ...
as long as the TSA will let it through.
Based on the responsese so far, I'm guessing, since the material is non
magnetic, and it's certainly not glass, that it must be extremely highly
What are these polished aluminum platters used for anyway (in the HDD)?
They have a very thin oxide coating on them for the magnetic surface.
They are so highly polished because they need to be very smooth since
the heads fly so close to the surface so the magnetic domains are as
small as possible so the bit density is as high as possible.
On Wed, 23 Jun 2010 07:30:51 +1000, Rod Speed wrote:
I thought they were reflective mirrors for the lasers or something.
I didn't realize these were the actual magnetic material. They are soooo
smooth and shiny. I expected concentric circular lines of something or
other like the bottom of a CDROM or DVD once it has been burned.
These platters are so polished that you can't make out a single bit of
"thin oxide" coating. Shinier than any metal or plastic mirror I've ever
seen and more indestructible than glass.
In short, they're the perfect wet-shower traveling mirror if TSA will allow
Older drives did use an oxide (like "ferric" magnetic tape cassettes).
Newer drives, such as the one which donated its platters for your
mirror, have a more complex magnetic recording layer. It's a complex
coating of alloys, vacuum-deposited on the polished aluminum (or glass
or ceramic) surface using a process known as sputtering. The
resulting magnetic layer has an extremely fine "grain" structure,
which allows for small magnetic domains and thus lots of storage per
You won't be able to see the lines which make up the individual data
tracks... they aren't physically carved or burned into the magnetic
coating, and consist only of varying patterns of magnetism.
Yes, the surface is very smooth and shiny. It needs to be - the disk
drive heads "fly" over the surface, at a height far less than the
diameter of a human hair. Even a particle of cigarette smoke is too
big to fit between the "flying head" and the surface.
Dave Platt < email@example.com> AE6EO
Friends of Jade Warrior home page: http://www.radagast.org/jade-warrior
And yet they let the FA's pass out aluminum pop cans, that when drained
and folded in half, then torn by flexing them across the edge of the
fold-down tray, make two dandy slashing weapons, with convenient hand grips.
To anyone who has had any training (and no, I haven't had any), the
cabin is full of all sorts of improvised weapons there for the taking,
not to mention how easy it is to make a weapon look like part of a
carry-on bag. Security theater, nothing more. The real security is the
armored cabin door, and the revised protocols for hijack situations. In
short, cabin crew and pax are expendable, and the bad guys know it.
Cabin crew and pax know it too, which is why you had people swarming the
last few idiots. Can't hijack a plane any more, but you may be able to
destroy one in flight.
another illusion to keep the sheeple lulled into some form of lassitude .
The first job of the school system. Grooming consumers, factory workers
and the military. and of course tax-payers all.
July 4 is a time when Americans celebrate life, liberty, and the
pursuit of happiness. But when we're spending hundreds of billions on
the Afghanistan War,not tho mention Iraq. and when we're cutting
education and unemployment
insurance benefits in a dismal economy, it's clear that War is
killing the American dream.
Let's get our priorities straight so... we can declare independence
from bloody, costly wars. and Oil.
Please share this video with your friends.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.