Jos,

Is it possible that one HD has cache and the other doesn't? Some HDs changed almost overnight in terms of coming without/with.

Are both HDs EIDE, or might one be SATA? A SATA drive has a different place to set this.

I also wonder if partitioning a HD might have some impact on the availability of the option. Might one be partitioned and the other not?

cheers

>Hi All
>
>I have two boxes with the same hdd, drivers, and controllers, same Windows, etc. On the one I have the option to enable/disable write behind cache under the hardware properties tab - disk drives node. On the other machine this option is not selectable, it is greyed out, and the check box appears to not be selected. Why can I access the check box on the one machine but not on the other when to all intents and purposes these are identical machines.