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- Path: FreeNet.Carleton.CA!de351
- From: de351@FreeNet.Carleton.CA (K. C. Lee)
- Newsgroups: comp.sys.amiga.hardware
- Subject: Re: Proper mask, transfer rate, etc.
- Date: 4 Apr 1996 23:22:51 GMT
- Organization: The National Capital FreeNet
- Sender: de351@freenet3.carleton.ca (K. C. Lee)
- Message-ID: <4k1lkb$a3j@freenet-news.carleton.ca>
- References: <4k1740$ddo@hobbes.compusult.nf.ca>
- Reply-To: de351@FreeNet.Carleton.CA (K. C. Lee)
- NNTP-Posting-Host: freenet3.carleton.ca
-
- Mark Worden (mworden@public.compusult.nf.ca) writes:
- >
- > Mask: 0x7ffffffe
-
- This tells the file system where data cannot be transfer directly from the
- driver directly. XXXe means data is word aligned and XXXc means it is
- long word aligned. So if you set it to long, and your program give it a
- word aligned address, the file system have to do an extra level of
- copying, hence slowing it down. Take a lot at the difference of
- your HD performance under long/word/byte aligned tests in DiskSpeed 4.1.
-
- Leave it at XXXXe if your hard drive controller can deal with it.
-
- > Max. transfer rate: 0xffffff
-
- ^^^^ !!! It is maximun transfer. It tells the
- hard drive how big a lump of bits can be transfered at a time. Not RATE !!
- (Rate implied something per time unit) IDE drive is supposed to use
- something smaller as it can only do 128K max (some even smaller)
-
- > I was told that I should have a mask of 0xfffffffc for the Zip drive (I
- > didn't get a suggestion for the hard drive...maybe it should be the
-
- Leave the mask the same on the same controller. Change maxtransfer for
- IDE hard disks.
-
- I get around 710K/sec in sysinfo for my Zip with my crappy homebrew
- controller and driver code.
-
- > / Mark Worden mworden@public.compusult.nf.ca \
-
- K. C. Lee
-
-