Talk:Bernoulli Box

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This article is based on material taken from the Free On-line Dictionary of Computing prior to 1 November 2008 and incorporated under the "relicensing" terms of the GFDL, version 1.3 or later.

Older Bernoulli Drive[edit]

I remember having a Bernoulli Drive back in probably 1984 or 1985. The "drive" was actually identical to the original IBM PC/XT case (big, lead, grey), even with the big orange power switch on the left rear side. It had two drives in it, each about half the width of the box. The cartridges were 10MB and were about 3/4 of the full length of the entire case. It connected to the IBM PC/XT by some large cable (possibly SCSI?). Each drive had a black button with a red LED on it. The drives were very unreliable, but it might be because the carts we had were old/overused. I remember losing a lot of data over the failure of the carts and our inability to get any service or a replacement drive. Does anyone remember what I'm talking about? /Blaxthos 05:32, 11 May 2006 (UTC)[reply]

Originally marketed as "The Bernoulli Box" by Iomega. This model was CDS-PC/20 , with dual 8.25" drives mounted in a standard IBM XT case. //Blaxthos ( t / c ) 03:29, 19 October 2021 (UTC)[reply]

Name Significance[edit]

What does Bernoulli's principle have to do with this disk? --Abdull 00:08, 29 November 2005 (UTC)[reply]

The pressure inside the drive is changed, which drives the "floating" magnetic media inside the cartridge. /Blaxthos

Please explain this - even as a physicist I have no clue how this is supposed to work (admittedly I'm not into solid state physics). Why is the magnetic media floating? What kind of pressure is involved? And how does all that affect the reading/writing? It must be some sort of secondary effect that is being exploited, enhancing the capacity, where as I understand the primary effect is that information is stored magnetically, just as is on another tape. --Erik

The disk media is flexible. When the disk is stationary, the read/write head is near the surface, but not close enough to work. When the disk roatates at speed, a bernoulli effect is created between the head and the media. Suction is created that warps the media so that it comes very close to the head. The system was said to provide hard disk type head gap tolerances, but using floppy disk style media. The floppy media was cheap, durable and high capacity, at least in comparison to the alternatives at the time. -- Austin Murphy (talk) 22:02, 2 January 2008 (UTC)[reply]

On a hard drive, the disk is fixed and the head floats. On a floppy drive, the head is fixed and the media floats? Iomega Bernoulli and Zip are just like floppy? Or not? Exactly how does Bernoulli principle apply, or not, to each of these cases? The Bernoulli's principle main article is generally and specifically useless, so these matters need to be addressed in this article.

BBC News 2006:

'Without Daniel Bernoulli we would not have a name for the effect that we rely on to make the hard disk work.

The Bernoulli Effect is what happens when a wing moves through the air - it floats. Just like an aeroplane's wing, the read head of a hard disk floats across the top of the disk.

"As the disk spins this lifts the head up off the media," explained Ian Keene of hard drive manufacturers WD.

He added: "Many people think the head is actually touching the media, but the distance between the head and the media is in the distance of 100 angstroms; to give you some idea of what an angstrom is, a human hair is about one million angstroms." ' -69.87.199.68 (talk) 20:58, 24 January 2008 (UTC)[reply]