Chuck Norcutt wrote:
> Why is it necessary to have a USB interface in order to recognize a hardware
> interrupt? In fact, if it doesn't recognize a hardware interrupt you are at
> risk of problems if you change cards and write to the card since the computer
> will probably be using the cached directory of the first card inserted.
>
I was not talking about USB, I specifically talked about the SATA
headers and further speculated that a specific direct I/O connection to
the main bus might have a similar problem on a specific computer. I was
simply speculating about a possible solution to his real world problem.
As to the generic question, of course it isn't necessary, nor desirable,
that a computer not generate an interrupt and/or that the OS not react
to it in the most desirable way. Nevertheless, my Intel motherboard and
Vista do not, in fact, recognize when a HD is connected or disconnected
to/from the SATA headers on the motherboard. Should they do so? Sure,
but I'm working with what exists, not theory.
I suspect the Intel hardware designers and/or the MS OS designers
figured nobody in their right mind would be changing HDs with the
computer on. So what did it matter if disks were only scanned on
boot-up? Then eSATA came along, which does exactly that, although
without opening the case. I've actually tried plugging and unplugging an
internal drive from the SATA headers as an experiment, and the problem
is indeed there, not in the eSATA header, cords or external devices.
> That leads to much ugliness which occurred in the early days of PCs with
> diskettes but has long since been solved. Are you also required to rescan
> when cards have been changed? I don't think so. If a rescan is
> required I would consider the hardware and/or software to be defective.
>
Sure! So are you offering to replace them? Neither am I, for myself nor
for anyone else, so I simply offered a practical possible solution that
doesn't cost money.
Moose
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