DIGITAL-LOGIC AG PCCP5 Manual V2.3
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4.6.5 CMOS Setup Harddisk list
Harddisk parameter selection
Since the BIOS autodetects the harddisk type, no HD-drive parameter table is used.
Go into the BIOS-HD-Setup and press autodetect. The parameters are read out of the IDE harddisk and
stored in the CMOS memory.
4.6.6 Harddisk PIO Modes
Block Mode (Multi-Sector) Transfer: Block mode boots IDE drive performance by
increasing the amount of data transferred.
No Block Mode: 512 Byte per interrupt
Block Mode: up to 64 kByte per interrupt
LBA Mode: LBA (logical block addressing) is a new method
of addressing data on a disk drive. In the standard
ST506 (MFM) ISA hard disk, data is accessed via
a cylinder - head - sector format.
LBA Mode disabled: max. 528 Mbyte per Disk
LBA Mode enabled: max. 8 Gbyte per Disk
Attention:
The BIOS enables the LBA Mode only, if the harddisk
was formatted on a system with enabled LBA. If the
drive (capacity > 528MB) is formated on a system
with disabled LBA, the AMI BIOS will never enable
the LBA mode !
The maximum parameters are:
1024 Cyl. , 16 heads, 63 Sec/Track
32 Bit Transfer: Some operating system can handle two 16bit word as
one 32bit access. This accelerates the IDE transfer.
Advanced PIO Modes: PIO-Mode: Timing: Transferspeed: Remarks:
IDE 0 600ns 2 Mbyte/sec Slowest I/O
IDE 1 383ns 5.5Mbyte/sec Standard I/O
EIDE 2 240ns 8.3Mbyte/sec Fast I/O, Mem.
EIDE 3 180ns 11,3Mbyte/sec IORDY Protocol
EIDE 4 120ns 16,6Mbyte/sec IORDY Protocol
EIDE DMA 1 160ns 13,3Mbyte/sec DRQ, ATA-2
Begin always with the PIO-Mode 0
in the manual mode (not autodetect) to test a new drive or if you becomes trouble in the automatic mode.
The autodetect mode selects with some drives wrong PIO modes.
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