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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 SIZE, etc. (was .. transfer rate)
- Date: 16 Apr 1996 22:29:10 GMT
- Organization: The National Capital FreeNet
- Sender: de351@freenet3.carleton.ca (K. C. Lee)
- Message-ID: <4l16vm$b9e@freenet-news.carleton.ca>
- References: <4k1740$ddo@hobbes.compusult.nf.ca> <4k1lkb$a3j@freenet-news.carleton.ca> <1997.6680T1431T1716@iig.com.au>
- Reply-To: de351@FreeNet.Carleton.CA (K. C. Lee)
- NNTP-Posting-Host: freenet3.carleton.ca
-
- > >>> Someone told me that the "c", "e" and "f" symbols represented byte, word or
- >>> long offsets (I'm getting way out of my depth here though) according to the
- >>> host system (eg., 16 or 32-bit etc). (?)
-
- It is alignment !! Not offset. It means addresses divisible by 1 or 2 or 4.
- It has everything to do with the limitation of the hardware design and driver
- software of the hard drive controller.
-
- a mask of XXXf means data can be transfer anywhere.
- XXXe means data can be transfer on word boundary
- XXXc means data can be transfer on long boundary
-
- If the drive can't handle it, then the filesystem has to first transfer it
- to either word or long word aligned memory and then copy it over. ie. It
- would be a bit slower.
-
- Finally it is maxtransfer SIZE, not rate !!! It tells the driver the
- limit on how big a chunk of data at a time to transfer NOT the data transfer
- rate.
-
- The default values for these parameter for the HDToolBox is for the A590,
- 2091, so your milage would vary.
-
- If I have to explain these terms again, I'm going to scream.... :(
-
- > Mark
-
- K. C. Lee
-