SMC Networks 1232 Series user manual Echs

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Translation Mode

Modern hard-disks have more cylinders than maximum number of cylinders permitted by DOS, so, theoretically, a DOS machine couldn’t use a modern big-sized hard disk. This problem is solved using a special addressing mechanism. This “mechanism” is called translation. The most common translation methods are LBA (Logical Block Addressing) and ECHS (Enhanced

Cylinders - Heads - Sectors).

Option	Description	Note
LBA (*)	LBA translation	Default setting for both
		ATAPI Units (Master1 &
		Slave1)
ECHS	Extended CHS translation	(*) = Default setting

Cylinders

Number of hard-disk cylinders (normally written on the disk label). If the autodetection is used (suggested method!), the cylinders value is ignored by the BIOS.

Option	Description	Note
0..65536	Number of cylinders	0 is the default setting for
		both ATAPI Units (Master1
		& Slave1)

Heads

Number of hard-disk heads (normally written on the disk label). If the autodetection is used (suggested method!), the heads value is ignored by the BIOS.

Option	Description	Note
0..64	Number of heads	0 is the default setting for
		both ATAPI Units (Master1
		& Slave1)

Sect/Tr

Number of sectors per track (normally written on the disk label). If the autodetection is used, the sectors value is ignored by the BIOS.

Option	Description	Note
0..255	Number of sectors per track	0 is the default setting for
		both ATAPI Units (Master1
		& Slave1)

Size (MB)

This is the hard-disk size, in Mbytes, calculated by the BIOS, using either the autodetect method or the user hand-written values (for cylinders, heads and sectors).

•Note: the size cannot be changed directly by the user.

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