function will fill in before returning:
#dispitems1399#
The information in 123 is <#1404#> not<#1404#> the physical geometry of the
drive, but only a <#1405#> logical<#1405#> geometry that is identical to the <#1406#>
logical<#1406#> geometry used by MS-DOS to access the drive. The distinction
between physical and logical geometry cannot be overstressed.