>Date: Thu, 09 Jan 2003 10:45:32 -0800 >From: "Robert P. McAllister" <[EMAIL PROTECTED]>
>Ross Hunter wrote: >> Hello All, I just bought a new 18 GB IBM scsi hard drive (ultrastar 73ZX) >> from OWC and I can't get decent throughput. It's a 68 pin drive with a >> provided converter to 50 pin. I'm running it on an 8600/200 with 640 MB of >> RAM, VM off. I'm using another drive to terminate the chain and it has a >> unique I.D. I formatted it with HDT and ran the numbers after I received >> disk too slow errors when writing multitrack audio. The seek times are >> phenomenal but the throughput is about 1 MB a second. My old stock drives >> move 5-7 MB a second! It's a 10,000 RPM Drive so I assumed it would behave >> as well (or better) than my old drives. I don't know if it's looking for too >> much information (hence busying the bus) or what? Do I need a scsi >> controller card to configure the drive correctly? I figure if you guys don't >> know then nobody does! Thanks in advance, >> >One of the problems with using an adapter is that you're still >restricted to the internal SCSI bus (10MB/sec.), which defeats having a >fast hard drive. Though in your case it's worse for some reason. A >controller card would be a good idea. Yes, any reasonably modern hard drive should manage close to the 10 MB/s which the SCSI bus limits you to. However, using adapted drives is always dicey. Does the converter you are using terminate the upper 18 pins of the drive? If not, that's most likely your problem. Your overall SCSI bus is terminated but the upper 18 lines on the SCSI drive are not terminated and it's causing problems with that one drive. If this is the case move the adapted drive to the end of the SCSI cable and enable termination on the drive (assuming it isn't an LVD drive, which lacks on-board termination ability). And, of course, disable termination on the drive you'll be moving away from the end of the chain. Jeff Walther -- PCI-PowerMacs is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Refurbished Drives | -- Sonnet & PowerLogix Upgrades - start at $169 | & CDRWs on Sale! | Support Low End Mac <http://lowendmac.com/lists/support.html> PCI-PowerMacs list info: <http://lowendmac.com/lists/pci-powermacs.shtml> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive:<http://www.mail-archive.com/pci-powermacs%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
