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Re: Disk II Checksum

Subject: Re: Disk II Checksum
From: "Alex Freed" <alexf@mirrow.com>
Date: Fri, 9 Feb 2007 16:26:12 -0800
Newsgroups: comp.sys.apple2
References: <45cbe75f$0$24734$4c368faf@roadrunner.com> <SLydnXx975xZfVHYnZ2dnUVZ_uPinZ2d@comcast.com>
Xref: g2news2.google.com comp.sys.apple2:17261

"Michael J. Mahon" <mjmahon@aol.com> wrote in message 
SLydnXx975xZfVHYnZ2dnUVZ_uPinZ2d@comcast.com">news:SLydnXx975xZfVHYnZ2dnUVZ_uPinZ2d@comcast.com...
> There is one chance in 256 of an incorrect read producing
> a correct checksum, but this level of integrity checking
> seems to be sufficient.

Assuming all errors are equaly probable.

-What are the odds of meeting a dinosaur on the street?
- Fifty-fifty. Either you meet it or not!

I'm not an expert at all, but as I recall it CRC was invented
because the odds of finding an error are much better than
using a simple 16 bit checksum.

-Alex.

Follow-Ups:
- Re: Disk II Checksum
  - From: "Michael J. Mahon" <mjmahon@aol.com>
- Re: Disk II Checksum
  - From: "Peter Watson" <paw77@N_O_hotmail_S_P_A_M.com>
- Re: Disk II Checksum
  - From: russotto@grace.speakeasy.net (Matthew T. Russotto)

References:
- Disk II Checksum
  - From: "Bryan Parkoff" <nospam@nospam.com>
- Re: Disk II Checksum
  - From: "Michael J. Mahon" <mjmahon@aol.com>

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