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- Path: news.seinf.abb.se!usenet
- From: johan.hogberg@senet.abb.se (Johan H÷gberg)
- Newsgroups: comp.sys.amiga.hardware
- Subject: Re: Iomega ZIP drive and AFS
- Date: 3 Mar 1996 20:30:22 GMT
- Organization: ABB Network Control AB
- Message-ID: <4hcvgu$k9o@sdaw04.seinf.abb.se>
- References: <4ha8n7$8u2@sdaw04.seinf.abb.se> <4hc4en$lfa@gordon.enea.se>
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-
- In article <4hc4en$lfa@gordon.enea.se>, olli@enea.se says...
- >
- >Johan H÷gberg wrote:
- >
- >> When formatting a ZIP with AFS file system (AmiFileSafe) 88MB
- >> becomes free.
- >> When formatting a ZIP with FFS file system 95MB becomes free.
- >>
- >> The 95MB value is verified and true. 94 files of each 1024*1024
- >> bytes was copied into 10 directories. After that there was
- >> still 0.5MB free.
- >>
- >> But with AFS 88MB is reported and it would seem strange
- >> that 95MB would fit when 88MB is reported.
- >>
- >> Anyone familiar with this problem? Anyone having a clue?
- >
- >Not a total answer to your question, but maybe a step in the right
- >direction. As I have gathered from information on the AFS mailing
- >list AFS reserves a fixed part of the disk when formatting it. This
- >part of the disk is used for directory and file headers. If you only
- >have a few large files on your disk much of this space will be unused
- >(wasted?). For now the amount of header space is a fixed fraction of the
- >total disk/partition size and cannot be configured. FFS manages disk space
- >in a very different way and current disk info programs calculate disk info
- >data according to the FFS algorithm which is not very proper for AFS disks.
- >
- >Disclaimer: all this information could be my delirious phantasies.
- >
-
- Ok, that can explain it. But it's still strange because when reading the AFS docs
- it's sayd that AFS is more efficient of using diskspace. And *it is* on floppies.
-
- The question is however then: How many files shall be written until this fixed
- area gets filled? And what happens after that?
-
- This fixed area is then 95-88 = 7MB of diskspace. This means that there is no point
- in making HD partitions less or equal to 7MB.
-
- There's a lot to check here. I'll be back.
- BTW, an AFS Zip Disk can hold 88 files of each 1024*1024 bytes. (10 directories, 300K still free)
-
- /Johan Hogberg
-
-