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This Hartl Optical Disk from 1925 is part of the "Dynamic Equilibrium" display at the Nott Memorial on the campus of Union College in Schenectady. The display explores the intersection of art and science.
The Hartl Optical Disk is designed to demonstrate important principles of optics, such as reflection by various shapes of mirrors, refraction through several types of lenses, total internal reflection and dispersion. The apparatus consists of a satin finished metallic disc about 30mm in diameter, graduated around the circumference. On the back of the disc is a handle that is used to to rotate the disk through 360 degrees in a vertical line about a horizontal axis perpendicular to the plane and passing through the center of the disc. The disc is partially shield by a fully-adjustable hood. On the hood, a circular plate has slits to allow rays of light to pass through and fall on the optical elements. The hood also has a slot for placing red, green, and blue filters.
Now for the photo info: I started out thinking that a 5 exposure HDR would look good, however the background was too overpowering. So I clipped the disk from the photo, and made two copies of the background. The base copy was convered into B&W and the overlying copy was blured slightly and made 40% transparent.
Let me know what you think of it...
Freda Payne song. Her other big hit was "Band of Gold" about a wimped out "husband":
"That night on our honeymoon
We stayed in separate rooms."
A carved stone disk from the Asian Art Museum in San Francisco. (One of my favorite museums of the world, and they even let you take photos!)
Disk-O-Knowledge, Inc., New York. Copyright 1931.
8.5 in. ∅
Hand writing on both sides.
U.S. Patent No. D-84,114
www.google.mu/patents/USD84114
L4.
The image (right) shows the disk fluorescing blue under 368nm LED excitation. The spectra show three different regions fluorescing under 365nm LED and 404nm laser excitation. The blue spectral structures, appearing more prominently under 365nm excitation, may arise from surface contamination associated with the scratches seen in the image. The main fluorescent peak shifts about 12 nm between the 365 and 404nm excitation.
The transmission spectrum is shown in brown.
How to check hard disk health on Linux using smartmontools
If you would like to use this photo, be sure to place a proper attribution linking to xmodulo.com
30th September: Hard disk in it's birthday suit
Spent ages trying to get an interesting shot and processing of this defunct hard disk, not worked as well as I'd hoped, but still it's a photo ;-)
I bought two 2TB disks on "Black Friday," taking my total to 10.5 terabytes in operation. They're all* paired for backups, so it's really only 5TB of storage. Formatted, of course, it's even less. Here're some real numbers:
Filesystem Size Mounted on
/dev/disk2s2 465Gi /Volumes/Butch
/dev/disk5s2 931Gi /Volumes/Raphael
/dev/disk3s2 931Gi /Volumes/VanGogh
/dev/disk7s2 931Gi /Volumes/Mars
/dev/disk8s2 931Gi /Volumes/Pluto
/dev/disk9s2 931Gi /Volumes/Terra
/dev/disk10s2 931Gi /Volumes/Jupiter
/dev/disk6s2 1.8Ti /Volumes/Marvin
/dev/disk4s2 1.8Ti /Volumes/Hal9000
931GB isn't quite 1TB, but I round up.
* All are paired except the 500GB "Butch", which is itself a backup drive for two networked laptops and a 500GB external drive connected to one of those laptops, not pictured here.
Second shipment - rusty, scored, greasy rotors, not described. The closer pair were cleaned up using spray brake parts cleaner and a rag. The left one of the upper pair, first shipment, show evidence of a half-hour's work with brake parts cleaning fluid and a Scotch scrubber pad.
They strung me along with empty promises until the dispute period expired, then ignored my pleas. More fool me, but that makes them thieves, doesn't it?
(Someone asked for an update: It's been two years or more. The point was: Even such high-volume and highly-regarded sellers can be rats from time to time. If they have something you want, at a price you like, it will probably be a problem-free transaction, but don't be surprised if there is something wrong, and do your objection and claims routines early. Don't let them run out the dispute period, as I did.
Matter of fact, I have something coming from them tomorrow (03 June 2009). We'll see how it develops ...)
(A week later: This one was perfect: excellent price, careful packing, timely delivery of an item that is exactly as advertised. I guess every one is a gamble; win a couple, lose a couple.)
Some old hard disk I had with me. This one is maxtor 10GB..finally I Found the star-screwdriver that can open this thing.. :)
got this idea from nickwheeleroz's 'drive week'
strobist info: one sb-28 on camera left shoot from top of the drive with blue gel 1/16 power and home made snoot, one 2b-28 on camera left shooting at the layers with an orange gel 1/16 power. One sb-800 shooting from the back of the drive with 1/16 power, all controlled with PW.