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Other - AHA-1740A (564.19 kb)

• Make sure that the SCSI boot drive address is set to SCSI ID 0:0. Check the drive installation manual for information about setting the SCSI ID for that device. The Return Installed Devices utility in the Onboard utilities can also be used to determine the SCSI addresses of peripherals on the SCSI bus. • Make sure that SCSI parity is consistently enabled or disabled on all devices on the SCSI bus. • Verify the proper installation and configuration of the host adapter and SCSI devices. • Power should be cycled OFF and ON after changing any values on a host adapter, setup program, or SCSI device, to be sure that a DOS format operation has been successfully completed. • Make sure that the SCSI bus is properly terminated. • Make sure that the intended boot disk has an active DOS partition and a DOS format. • Check the cabling. Problems Using a SCSI and a Standard Disk Drive The drives are configured as SCSI disk drive D and standard disk drive C. • Make sure that the second standard fixed disk is mapped out of the system. EISA-to-Fast SCSI Host Adapter Troubleshooting • Make sure that the SCSI drive to be used as drive D is set to SCSI ID 0:0. Check the drive manual for information on setting the SCSI ID for that device. The Return Installed Devices utility in the Onboard utilities can also be used to determine the SCSI addresses of peripherals on the SCSI bus. • Make sure that SCSI parity is consistently enabled or disabled on all devices on the SCSI bus. • Verify that the host adapter and the SCSI devices are properly configured and installed. • Power should be cycled OFF and ON after changing any values on a host adapter, setup program, or SCSI device to be sure that the new initial values are loaded. • Make sure that the SCSI bus is properly terminated. • Make sure that the disk has a DOS partition and a DOS format. • Check the cabling. Problems Using Two SCSI Drives The drives are configured as SCSI disk drive D and SCSI disk drive C. • Make sure that both standard fixed disks are mapped out of the system with the setup program. • Make sure that the SCSI drive to be used as drive D is set to SCSI ID 0:1 or 1:0. Check the drive manual for information on setting the SCSI ID for that device. The Return Installed Devices utility in the Onboard utilities can also be used to determine the SCSI addresses of peripherals on the SCSI bus. adaptec AHA-1740A/1742A/1744 • Power should be cycled OFF and ON after changing any values on a host adapter, setup program, or SCSI device to be sure that the new initial values are loaded. • Make sure that SCSI parity is consistently enabled or disabled on all devices on the SCSI bus. • Verify that the host adapter and the SCSI devices are properly configured and installed. • Make sure that the SCSI bus is properly terminated. • Make sure that the disk has a DOS partition and a DOS format. • System works erratically, hangs, or the host adapter cannot always find the drives. • Check SCSI parity for consistency. • Check termination. • Check cable length and integrity. • If host adapter and drive LED remain on during a hang condition, make sure that the SCSI drive conforms to the Common Command Set Revision 4B (CCS 4B). If only the host adapter LED remains on during a hang, it is probably a host adapter to computer system interface problem. The system may not be capable of First-Party DMA transfers. Check with the system manufacturer for information. Some older motherboard BIOS do not support freeform data for the EISA configuration. This support is required in order to changed the default Host Adapter options. If freeform data is not supported, the AHA-1740A/1742A/1744 can still be used, but the Host Adapter option defaults will always be used. p Appendix A Disk Drives Over 1 Gigabyte Extended Translation (Using DOS 5) Adaptec host adapters have always supported the full range of disk drive sizes under all major operating systems. As disk drives have recently grown beyond 1 Gigabyte in formatted capacity, they have run up against the DOS 1024 cylinder limit. To continue to provide support of all SCSI disk drive capacities under DOS, Adaptec has introduced extended translation for the AHA-1740A/1742A/1744. This new feature bypasses the DOS disk capacity limit and supports disk drives up to 8 Gigabytes in size under DOS, providing room for years of disk drive evolution. The DOS 1 Gigabyte Limit All versions of DOS are limited to 1024 cylinders of capacity per drive. The standard translation scheme for SCSI host adapters, using 64 heads and 32 sectors, provides a maximum accessible capacity of 1 Gigabyte. To eliminate the 1 Gigabyte limit, Adaptec’s new extended translation feature uses 255 heads and 63 sectors, extending the disk drive capacity limit under DOS to 8 Gigabytes. adaptec AHA-1740A/1742A/1744 When to Use Extended Translation With DOS Version 5 Only NetWare 386O and the newer versions of UNIX do not share the 1024 cylinder limit of DOS and do not require extended transla...

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