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From: sns@acp.UUCP
Newsgroups: comp.sys.amiga
Subject: Re: hard disk flaw problems
Message-ID: <412@acp.OZ>
Date: Wed, 2-Dec-87 20:48:46 EST
Article-I.D.: acp.412
Posted: Wed Dec  2 20:48:46 1987
Date-Received: Wed, 9-Dec-87 00:46:17 EST
References: <1884@cadovax.UUCP> <2605@masscomp.UUCP> <1888@cadovax.UUCP> <2859@cbmvax.UUCP>
Organization: Australian Computer Products, Perth, Australia
Lines: 28
Keywords: hard disk format flaws
Summary: Max partition size = 26*127*32 blocks

In article <2859@cbmvax.UUCP>, grr@cbmvax.UUCP (George Robbins) writes:
> 
> The current filesystem limitations are 56 MB per >>>> PARTITION <<<<

Actually, the maximum partition size is :-
  26  bitmap block ptrs
* 127 long-words per bitmap block
* 32  bits per bitmap block
------
105664 blocks/partition = about 52Mb (51.6Mb)

My company has developed a hard disk subsystem for the Amiga using SCSI.

The driver scans the SCSI bus to look for active hard disks. It then constructs
device tables for each hard disk, and for large drives (e.g. over 52Mb) it
breaks the drive down into a number of logic partitions. The nice thing
about doing it this way is the end-user can ignore the whole problem of
device & partition sizes. For example, if a 100Mb drive and a 20Mb drive is
connected (as on my work Amiga-2000), then three logical partitions are
created.

This seems to be a workable solution to the partition & mountlist problems.

sssss  n   n  sssss    Stuart Nixon           (Australian Computer Products)
s      nn  n  s        Phone:   +61 9 322 6497
sssss  n n n  sssss    Usenet:  ...{decvax,hplabs}!munnari!acp.oz!sns 
    s  n  nn      s    ARPAnet: sns%acp.oz@seismo.css.gov
sssss  n   n  sssss    ACSnet:  sns@acp.oz