-1 MaximumPhysicalPages in STORAGE_ADAPTER_DESCRIPTOR

NTDEV
1

What does it mean when the MaximumPhysicalPages member of
STORAGE_ADAPTER_DESCRIPTOR is reported as -1 (0xffffffff)?

Thanks,

Chuck

2

It may mean the driver isn’t doing DMA, or has a path to do large
operations without DMA and so there isn’t a limit on how much memory it
can transfer per request.

-p

-----Original Message-----
From: xxxxx@lists.osr.com
[mailto:xxxxx@lists.osr.com] On Behalf Of Chuck Batson
Sent: Friday, July 30, 2004 5:10 AM
To: Windows System Software Devs Interest List
Subject: [ntdev] -1 MaximumPhysicalPages in STORAGE_ADAPTER_DESCRIPTOR

What does it mean when the MaximumPhysicalPages member of
STORAGE_ADAPTER_DESCRIPTOR is reported as -1 (0xffffffff)?

Thanks,

Chuck

Questions? First check the Kernel Driver FAQ at
http://www.osronline.com/article.cfm?id=256

You are currently subscribed to ntdev as: xxxxx@windows.microsoft.com
To unsubscribe send a blank email to xxxxx@lists.osr.com

3

Thank you, Peter. So it means, effectively, a maximum of roughly 4
billion pages. :wink:

Chuck

----- Original Message -----
From: “Peter Wieland”
To: “Windows System Software Devs Interest List”
Sent: Friday, July 30, 2004 10:53 PM
Subject: RE: [ntdev] -1 MaximumPhysicalPages in
STORAGE_ADAPTER_DESCRIPTOR

> It may mean the driver isn’t doing DMA, or has a path to do large
> operations without DMA and so there isn’t a limit on how much memory
it
> can transfer per request.
>
> -p
>
> -----Original Message-----
> From: xxxxx@lists.osr.com
> [mailto:xxxxx@lists.osr.com] On Behalf Of Chuck Batson
> Sent: Friday, July 30, 2004 5:10 AM
> To: Windows System Software Devs Interest List
> Subject: [ntdev] -1 MaximumPhysicalPages in STORAGE_ADAPTER_DESCRIPTOR
>
> What does it mean when the MaximumPhysicalPages member of
> STORAGE_ADAPTER_DESCRIPTOR is reported as -1 (0xffffffff)?
>
> Thanks,
>
> Chuck
>
>
> —
> Questions? First check the Kernel Driver FAQ at
> http://www.osronline.com/article.cfm?id=256
>
> You are currently subscribed to ntdev as:
xxxxx@windows.microsoft.com
> To unsubscribe send a blank email to xxxxx@lists.osr.com
>
> —
> Questions? First check the Kernel Driver FAQ at
http://www.osronline.com/article.cfm?id=256
>
> You are currently subscribed to ntdev as: xxxxx@cbatson.com
> To unsubscribe send a blank email to xxxxx@lists.osr.com
>