>Bus 0 is internal only, and is 10 MB/sec. > >Bus 1 is internal AND external, and is 5 MB/sec. > >The reason for including a 5 MB/sec internal bus apparently was >incompatibilities with certain internal peripherals in early PCI >Macs (Zip ?).
Also, perhaps tradition? The external bus has come with an internal connector for quite a while. My 9600 has one, as does my 8100 (though it is way up in the corner and hard to get to). Apple doesn't expect anybody but power-users to use that extra internal SCSI bus, so it doesn't even come with cables. Back In The Day, people that needed high transfer rates but couldn't afford fast and wide drives and JackHammer cards to do RAID with would take a pair of regular old slow narrow drives and put one on each internal connector of the 8100, and stripe 'em. Each bus is only 5 MB/s, but the disks of the RAID are on seperate busses, so ideally you can get 10MB/s out of such an arrangement. Not quite that high in reality, but it is signifigantly higher than a single drive. Upward of 5 MB/s, anyway. I had that arrangement (striping across the internal slow busses) in my 8100 when I was running linux on it. It seemed super fast, it was quite a pick-me-up. -Tyler -- 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
