Jackhammer is a SCSI controller PCI card made by....FWB ? Can't remember which SCSI - maybe UltraWide. What type of SCSI drive is this 17 gb ?
JackHammer was a product of FWB back when FWB produced quality Mac stuff. They used to be the best.
However, by the time the JackHammer came in PCI flavors (the name was first on NuBus cards) I think that FWB had sold off their hardware business to Streamlogic. If it wasn't at that time, it was not too long afterwards.
The JackHammer PCI cards were UltraWide. They died before they made anything U2W. Anyway, Streamlogic seems to have died and left all its marbles to yet another company, which had the FWB drivers up on their web site a year or two ago. I haven't checked to see what the current situation is.
So, if the original poster's 17 GB SCSI drive is an UW, he may be getting a performance improvement by having it connected to the JackHammer, because UW is theoretically up to four times faster than the motherboard's built-in SCSI bus.
In practice this depends a great deal on the hard drive. A 17 GB is probably recent enough to out perform the motherboard SCSI (deliver data faster than 8 - 10 MB/s) so there probably is a benefit to using the JackHammer card. If the drive was a 4 GB or even an 8-9 GB, there would be a good chance that the drive is old enough that it doesn't really gain a performance advantage from being on the faster SCSI bus. Many of the drives from about four years ago (or earlier) do not break 10 MB/s in actual performance and 4 GB and 9 GB drives were a common size back then.
Jeff Walther
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