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Technology Stocks : Disk Drive Sector Discussion Forum -- Ignore unavailable to you. Want to Upgrade?

To: Bill Lin who wrote (2748)	3/9/1998 1:41:00 PM
From: T Bowl	Read Replies (2) \| Respond to of 9256

Bill - I don't know of a real formula for coercivity requirements given a certain areal density, but that doesn't mean there isn't one. What I usually reference is some info HMTT furnished back a few Qs ago: Coercivity GB/disk 1800 0.5GB 2000 - 2100 1+GB 2200 - 2400 1.2 - 1.6GB 2400 - 2500 1.7 - 2.1GB 2700 2.X GB 2800 3.5GB 3000 4.4GB I kinda keep checking up on this table every time I see a reference, and it seems close, but no guarantees. I've also never seen any info that would tell me what the area is for a 3.5" disk. I think i depends on layout, bearing sizewhether they use a landing zone, etc,whether they use a landing zone, etc. It varies from one maker to another, but roughly it's about 11.25in^2 per 2 sided platter. I've heard that the 5.25" platter has 1.9X the area of a 3.5" platter. These are all rough, but the best I've got. Sorry, no exact #s... BTW, I'd love for someone in the know to let me know... todd