Article View: comp.sys.ibm.pc
Article #39788Re: MFM as an RLL drive?
From: Phil Ngai
Date: Thu, 14 Dec 1989 23:36
Date: Thu, 14 Dec 1989 23:36
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In article <6252@wpi.wpi.edu> ear@wpi.wpi.edu (Eric A Rasmussen) writes:
|The basic problem is that the coating on the disk is not designed to handle
|the density of data used by the RLL format, and it WILL 'forget' what you have
|stored there.
Sorry, this is untrue. MFM and RLL both put the SAME number of flux
changes on the platter. RLL just uses them more efficiently. RLL does
require the flux changes to be more accurately placed timing-wise but
most drives have no problem with this.
Since there are no more flux changes with RLL than MFM, there is no
problem with them being too close together and spontaneously
disappearing.
--
Phil Ngai, phil@diablo.amd.com {uunet,decwrl,ucbvax}!amdcad!phil
Washington D.C. is the murder capital of the nation.
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Path: arc1-ca.pugleaf.net!utzoo!attcan!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!swrinde!zaphod.mps.ohio-state.edu!wuarchive!decwrl!amdcad!diablo!phil From: phil@diablo.amd.com (Phil Ngai) Newsgroups: comp.sys.ibm.pc Subject: Re: MFM as an RLL drive? Message-ID: <28402@amdcad.AMD.COM> Date: 14 Dec 89 23:36:26 GMT References: <MLM.89Dec11110300@hector.cs.brown.edu> <6252@wpi.wpi.edu> Sender: news@amdcad.AMD.COM Reply-To: phil@diablo.AMD.COM (Phil Ngai) Distribution: comp Organization: Advanced Micro Devices, Inc. Sunnyvale CA Lines: 17