PF> Yes -- particularly if the drives are on separate disk
 PF> controllers; OS/2 can get all the non-pio ones 
 PF> busy at the same time.

 CH> Would there be any advantage in a mixed PIO IDE and 
 CH> DMA/busmaster SCSI system?

Yes;  although the PIO controller must wait for each i/o, os/2 can start a
dma transfer on the SCSI controller (and wait for the 'completed' interrupt
in the meantime).

 CH> As I recall, the category 9 IOCTLs require that the drive be locked, 
 CH> which is something I can't do because the program will 

Good point.  I think Mike had a better suggestion,  but I haven't used it
myself (ioctl cat 8, DSK_GETLOGICALMAP)


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