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- Path: grapool30.rz.uni-frankfurt.de!news
- From: raftopou@stud.uni-frankfurt.de (Joerg Raftopoulos)
- Newsgroups: comp.sys.amiga.hardware
- Subject: Re: Proper mask, transfer rate, etc.
- Date: 07 Apr 96 00:06:30 +0100
- Organization: J. W. Goethe-Universitaet Frankfurt/Main
- Message-ID: <2365.6671T6T1540@stud.uni-frankfurt.de>
- References: <4k1740$ddo@hobbes.compusult.nf.ca> <4k1lkb$a3j@freenet-news.carleton.ca>
- NNTP-Posting-Host: dialin185.rz.uni-frankfurt.de
- X-Newsreader: THOR 2.22 (Amiga;TCP/IP) *UNREGISTERED*
-
-
- KCL> Mark Worden (mworden@public.compusult.nf.ca) writes:
- >>
- >> Mask: 0x7ffffffe
-
- KCL> This tells the file system where data cannot be transfer directly from t
- KCL> driver directly. XXXe means data is word aligned and XXXc means it is
- KCL> long word aligned. So if you set it to long, and your program give it a
- KCL> word aligned address, the file system have to do an extra level of
- KCL> copying, hence slowing it down. Take a lot at the difference of
- KCL> your HD performance under long/word/byte aligned tests in DiskSpeed 4.1.
-
- may i quote from the original post?
-
- MW> Can anyone tell me what the proper mask, transfer rate, etc. should be on
- MW> my A3000 with 100MB Quantum hard drive and a Zip drive? Both drives have
- MW> been formatted with the Fast File System (I have Workbench v2.1).
-
- so we are talking about the amiga 3000 scsi dma hostadapter. an extreme
- efficient design that has nothing in common with those crappy a1200/4000 pio
- ide implementations. the correct values are shown in amiga 3000`s manual (us
- edition) in chapter 6 (using a harddisk) on page 66 a screenshot labeled
- "setting file system characteristics" says: mask = 0xfffffffc and
- maxtransfer = 0xffffff
-
-
- KCL> Leave it at XXXXe if your hard drive controller can deal with it.
-
- >> Max. transfer rate: 0xffffff
-
- KCL> ^^^^ !!! It is maximun transfer. It tells the
- KCL> hard drive how big a lump of bits can be transfered at a time. Not RATE
- KCL> (Rate implied something per time unit) IDE drive is supposed to use
- KCL> something smaller as it can only do 128K max (some even smaller)
-
- eventually needed max transfer limitations are a fix for poor designed ide
- drives. amiga users know that there is a live beyond 64kbyte hehehe
-
- the suggested max. transfer value of 0xffffff is ok.
-
- >> I was told that I should have a mask of 0xfffffffc for the Zip drive (
- >> didn't get a suggestion for the hard drive...maybe it should be the
-
- is your zip mounted via devs:dosdrivers/zip or mountlist entry? just fill
- in proper (mask = 0xfffffffc, maxtransfer = 0xffffff) values.
-
- bye!
- jr.
-
-
- SOL LUCET OMNIBUS
-
- Joerg Raftopoulos, Amiga User since 1987
- 3 x A1000, 1 x A500, 2 x A2000, 1 x A1200, 2 x A3000 Owner
- Student at J. W. Goethe Universitaet, Frankfurt am Main, West Germany, Sol III
-
-