CompuServe Messages

MK >>I need some help here with an IDE drive in an A4000. […] The PROBLEM emerged when I tried copying over some large programs & files (>200K).<< This is a very common problem. The default Maxtransfer rate is setup for a SCSI drive, and not for IDE drives. The IDE's have different limitions, and one is the maximum amount of data that can be sent in one write. I believe the standard allows for at least 128K writes. However, most IBM IDE interfaces only do 64K writes and don't use the MULTIPLE READ & MULTIPLE WRITE commands — which has allowed IDE manufactures to be a little sloppy with the standard. Using HDToolBox, change the value of MaxTransfer to equal '0x1fe00', for each partition. This will alter the maximum size of the data packets the Amiga will send to the drive at a time to 128K (minus 512 bytes). Also, some IDE drives also have smaller RAM buffers/caches built into them, and can't handle the larger (>64K) packets the Amiga can feed them. Ron. – ap'ing with AP. (Eagles may fly, but weasels aren't sucked into jet engines.)