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Article #11768

Re: Harddisks/Bitmaps/FFS

#11768
From: Larry Phillips
Date: Sun, 12 Mar 1989 00:29
25 lines
1522 bytes
In <8903091628.AA05318@jade.berkeley.edu>, G35@DHDURZ1.BITNET (Werner Guenther) writes:
>I'm currently writing (yet another) program to recover damaged disks, but
>I have one big problem:
>What is the maximum size of a partition under FFS ? Under the old file
>system the root block has room for 26 pointers to bit map blocks, giving
>26*127*32=105664 sectors or about 52.5 megabytes.
>As far as I know, FFS does not such a limitation.
>What exactly did change ? Are those bitmap blocks linked together somehow ?
>If yes, how ?

 The FFS supports a 2 Gigabyte partition (all bits bu the sign in a longword).

 The extra bitmap block pointers are kept in a 'bitmap extension' block,
pointed to by the contents of longword $68 in the root block.

-larry

--
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+----------------------------------------------------------------------+ 
|   //   Larry Phillips                                                |
| \X/    lphillips@lpami.wimsey.bc.ca or uunet!van-bc!lpami!lphillips  |
|        COMPUSERVE: 76703,4322                                        |
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From: lphillips@lpami.wimsey.bc.ca (Larry Phillips)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Harddisks/Bitmaps/FFS
Message-ID: <2320@van-bc.UUCP>
Date: 12 Mar 89 00:29:31 GMT
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