Dont compare 5 yr old scsi with brand new ata/100 drives.
Ever since we could start using DMA with IDE drives the cpu utilization
dropped like a rock. That is probably why apple went with IDE (that and the
fact they needed to start making cheaper Macs to stay profitable)
SCSI is still the fastest storage HD around (the 15k rpm ones) but the cost
for this speed title is alot of money, expensive cards, and alot of noise
and heat.
I slapped a 60gb 7200 rpm drive into my 8500 and its very fast. Runs circle
around the old 2gb scsi quantum I had in it.
----- Original Message -----
From: "Martin Thomas-WLTM07" <[EMAIL PROTECTED]>
To: "PCI PowerMacs" <[EMAIL PROTECTED]>
Sent: Monday, August 20, 2001 11:39 AM
Subject: SCSI vs IDE
> I have been doing some research on the benefits of SCSI over IDE.
>
> Seems the magic ingredient in SCSI that makes it superior is that the SCSI
> controller handles the data read/write requests for the CPU, where IDE
relys
> on the CPU to do the task.
>
> This might explain why Apple went SCSI and not IDE and why typically Mac
> performance was superior to the PC's all things being the same other than
> drive (and the choking Windoze OS). And might also be why Mac's don't
need
> near as much RAM as PC's.
>
> BUT, in my "informal" SCSI tests for my 9500/150 with internal Fast SCSI
> (AKA SCSI2, 10MB/sec) I could cmd "D" a file of 101MB and dup it in 52
> seconds. Pretty slow in my book. That is a whopping 1.94 MB/Sec. I did
> similar tests with randomly sized files and got 75 seconds for 101MB. So
it
> hurt some, but not too bad.
>
> My friend with a 700 MHzish Celeron PC and ATA100, with Win2K did it in 4
> seconds. So, 25 MB/sec. A little bit faster eh? When he did the test
with
> smaller files it slowed a larger % than the SCSI did. Here SCSI helps.
>
> He also has a ATA33 3.5GB drive and it took 25 seconds to do the same
file.
> So ATA33 is pretty slow, but still smoked my Fast SCSI.
> Thanks!
> Thomas Martin
>
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