Re: Hard drive speeds...

[handel@lars.acc.stolaf.edu (Peter F Handel)]

In article <35f0s4$knn@hermes.louisville.edu> twdorr01@starbase.spd.louisville.edu (Thomas Dorris) writes:
>I'm curious about the various speed ratings of some popular hard drive units.
>I checked my only reference here (a back issue of GS+) but it didn't have
>some of the specific values I was looking for.  In particular, is using a 
>SCSI harddrive with a RamFAST controller (with probably 1 meg on it) 
>noticeably quicker than, say, a Vulcan 40 or Vulcan Gold 100 meg unit?
>
>Thanks in advance again.
>
>ThomasD

Here are some access times of various common storage devices tested on a ROM 01
GS @ 8Mhz/16k ZipGSX.  The SyQuest drive is a 44MB Removable hooked up to an
Apple High Speed DMA SCSI card.
 
 
Time in milliseconds!  Measured with ProSEL 16 v8.84
 
 
Device         Linear Read    Random Read    OS Overhead
 
Apple 5.25"          33.64         366.02          1.07
UniDisk 3.5"        165.96         208.94         41.57
Apple 3.5"           16.75         150.03          4.67
HS DMA SCSI SyQuest   1.11          24.00          7.33
Vulcan 40Meg          4.85          15.57           .42
/RAM5 w/o Sys6 Driver 4.56       *7.16-9.57        4.25
/RAM5 w/Sys6 Driver    .82        1.57-1.63         .39
 
 
*: When the RAMDisk was at 32k, the Random Read rate was 9.57ms.  At 128k, it
was 7.49ms; at 256k, 7.20ms; and at 512k, the rate was 7.16ms.

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