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This is because the project, media, media cache and preview files are not crammed onto the OS disk. Using additional drives would have shaved about 20 to 30 seconds off of those 180-ish-second scores. On the other hand, cramming all of the working files onto the OS drive would have at least doubled the AVI Disk I/O portion of the benchmarks (time-wise) and might also have slowed down the MPEG-2 and H.264 portions as well.
Those findings are exactly why Adobe requires at least one additional hard disk in addition to the OS disk in order to run Premiere Pro.
As single disks, I did notice different times in the Disk I/O portion with different late-generation hard drives. But once pairs of the same model of drives are (R)aid0'd, there is very little (if any) difference in the Disk I/O performance times with any of the modern pairs of drives. Once the maximum sequential transfer speed of a given drive subsystem hits 200 MB/s, the differences in the disk subsystems virtually disappear. Thus, a drive subsystem with a sequential speed of 300 MB/s will not perform any faster in the PPBM5 AVI test than one with a sequential speed of 205 MB/s.
Message was edited by: RjL190365
Your explaination sounds reasonable to me for the all files on one disk scenario. Also my bad and apologies to Adobe regarding what seems to be my mis-intrepretation about running CS5 on a single disk (sounds like that is OK for the minimum requirements, so long as your drive is 7200 rpm).
try doing the same with a real 30 minute project i think you will find the outcome not favorable.
Longer projects are, indeed, where "single-disk" systems start to lag a bit. Any performance deficit is cumulative. A performance deficit of 20 seconds on a project less than one minute long can turn into a deficit that's several minutes long on such longer projects.
You also have to consider that many times the advice given is for optimization purposes. I have on occasion had to edit on an older Core 2 Duo Laptop with one internal and a USB external for media. It works, but it's far from ideal, and very frustrating compared to an i7 Desktop with several internal drives. The caution about using a network or a single drive is to avoid that frustration.
I have stated before that works if you don't mind the latency in the media manager and switching clips.