| From: | Colin Wenzel |
| Date: | 16 May 2000 at 16:15:38 |
| Subject: | Re: scsi vs ide |
On 16-May-00, mark krawczuk wrote:
> hi, what is a AMIJOE processor? is there really that much difference
> in speed between scsi and ide in speed? i had a a2000 scsi hd and
> scsi cdrom , and i dont think it was fast at all.
> a lot of people told me to get scsi, yeah `cause its really
> fast..... hmmm
> i have since changed over to a 1200 power flyer ide 4 way adapter
> etc..., after alot of people including amiga stores said that a IDE
> cd burner will not work, what a lot of trash, in fact now it craps
> all over 3 amiga setups from a amiga club with scsi that are supposed
> to be "quick" but i still want to go faster..... some one said get a
> AMIJOE processor ..
>
All Amiga SCSI devices operate in PIO Mode 0 (or 1)
which is the first attempt at scsi the Amiga had.
The transfer mode is unchanged over later models
because Comodore apparently didn't see the need
to improve it... (:/
The Phase 5 SCSI controllers work on a later mode &
effectively double the transfer rate, or even better with
a good caching system in place.
EG: On my 4000T/060, the native SCSI & IDE bus
with a "modern" seagate drive & no caching system,
transfers about 4Mb / sec - That's it !!!
The UW SCSI on the Cyberstorm, with an UW Quantum SCSI
drive gives me about 8Mb / second.
So, no matter what you hook on a "native" Amiga controller
you can forget about getting any more than 4Mb / sec.
Now, here's the bad news....
With FFS, large files with small block size can take quite
a bit longer to write, for instance, with the UW drive of mine
I have a 120Mb file, it takes nearly 25 seconds to write
with a 512 byte blocksize, but it should take 15 seconds
at 8Mb / second... The rest is taken up with FFS,
however, on a 2048 blocksize, it takes 19 seconds....
Enjoy........
-------------------------------------
Colin Wenzel. Australia.
EMAIL: mailto:colstv@hotkey.net.au
URL: http://www.hotkey.net.au/~colstv/
ICQ: 17608330
AMIGA: 4000T, 68060/50, 150Mb RAM,
OS 3.5, EGS Spectrum.
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