On Wednesday, January 15, 2003, at 11:44 AM, James S Jones wrote: > The PCI bus and the IDE bus are not the same thing. ATA is not measured > in MHz, however, so it should read ATA-33 and ATA-16. > >
Correct on my mistake in confusing the PCI Bus with the IDE buses OK on the ATA-33 .But what is ATA-16??? My understanding based on some on-line tutorials: The MOBO Ultra /DMA/33 Controller ( boot drive) maximum thruput is 33 MBytes/sec. ----Its "slang" expression is known as ATA-33 ----Also referred to as DMA Mode 2 ---Defining Standard is ATA/ATAPI-4 The ATA-3 , ATA PI Controller ( Zip & CD ROM) maximum thruput is 16 MBytes/sec-- ---Not defined any of the Ultra DMA modes: ---Defining Standard is ATA/ATAPI-4 I have corrected my previous post , as below just in case some " hard drive geek" stumbles across the original . In the B&W Service Source Manual, in the Troubleshooting section, there is a Block Diagram in the General Section. (I personally refer to this block diagram as the "bible", putting to rest all the "wives tales " about the B&W System) As I read it, the Primary PCI bus is 66MZ with only the PCI graphics card slot interfaced with this bus. A PCI-PCI Bridge then processes the Primary PCI , 66MHz bus into a Secondary PCI bus running at 33MHZ The Firewire & USB controllers, Paddington I/O controller, the ULtra/DMA/33 ( 33 MBytes/sec) controller and three PCI slots run directly off of this secondary bus The MOBO Ultra /DMA/33 controller dives the Boot Hard Drive. A Paddington I/o controller interfaces to the secondary bus ,creating a lower level bus that drives : sound/ I/O: Ethernet controller; CUDA; NVRAM 64 KB; and an ATA-3 (16 MBytes/sec)/ATA PI that drives the Zip and the CD ROM drives,respectively BTW. Numerous posts on the G3 List ( and mucho data on XLR8your mac) have delineated the unstability of adding a slave drive to the master boot drive on the MOBO IDE 33MHZ drivers. Apple Engineering messed this up, hence the V2 MOBO that changed the IDE controller chip allowing a reliable Master-Slave Hard Drive configuration If you must have and/or want master-slave, best bet is to add a PCI IDE controller ( PCI 33MHz bus) albert Trust but verify Ronald Regan -- G-List is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Refurbished Drives | -- We have Apple Refurbished Monitors in stock! | & CDRWs on Sale! | Support Low End Mac <http://lowendmac.com/lists/support.html> G-List list info: <http://lowendmac.com/lists/g-list.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/g-list%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
