> Can the G4 address that much space? Remember, the SCSI drives only have one parameter block for specifying the LBA (but there are several parameter block formats).
Small/large IDE drives are accessed in this way: 1) Small drives have one parameter block, whereas 2) large drives use the same parameter block as small drives, for the low-order 24 bits of the LBA, and a second parameter block for the high-prder 24 bits of the LBA, for a total of 48 bits. Should the drive receive just the first parameter block, then just the first 131,072 MB will be accessed. The drive temporarily waits for the second parameter block. If it is received, then the two 24 bit values are concatenated into a 48 bit LBA, and the access proceeds. It is for this reason that large IDE drives which are connected to an internal IDE port on a PPC Mac can only access 131,072 MB. However, some PPC Macs can have the LBA48 property turned on, by using certain special Open Firmware commands. This is what the Speedtools product simulated using a plug-in extension. But such an extension was not always required, if Open Firmware was employed to hack the LBA48 property. See info in ... http://www.seagate.com/staticfiles/support/disc/manuals/Interface%20manuals/100293068c.pdf ... starting at page 18. SCSI drives, which is what ATA drives are modeled after in PCI cards for Macs (and PCs), whenever a PCI card is employed for their access, have several parameter blocks, with various bit counts associated with the specification of the LBA, but only one such parameter block per access. -- -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to g3-5-list@googlegroups.com For more options, visit this group at http://groups.google.com/group/g3-5-list --- You received this message because you are subscribed to the Google Groups "G-Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to g3-5-list+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
