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Stephane,
Devices are allowed to pause at any time for any reason. Typically it
has to do with buffer management. Perhaps they reserve a block of buffer
for the first transfer but must then allocate more buffer for the rest of
the transfer ?
Each drive manufacturer is different in this respect. I think the pause
is just something you need to accept. I'm sure you would get a more
exact answer from the drive manufacturers, but the end result would be
the same.... They're not likely to change it.
...Harlan
---------------- Begin Message 1----------------
Date: 7/19/01 1:39 AM
Received: 7/19/01 2:08 AM
From: Stephane Cattaneo, [EMAIL PROTECTED]
Reply-To: Tom Colligan, [EMAIL PROTECTED]
To: T13, [EMAIL PROTECTED]
** This is the quasi-official and semi-temporary T13 email list server.
**
Dear all,
I am trying to make some UDMA transfer and when I try to make a writing
transfer of more than 1 sector (2 sectors
for example), using the DMA write command 0xCA, I have a device pause at
the end of the first sector (DMARQ not asserted), and I would like to
know why the device makes a pause. I am in UDMA mode 0, and I found only
one hdd, brand name Maxtor (31536H2, 5400 rpm), which accepts for
example a transfer of 20 sectors without saying someting (it starts
crying after a request of more of 70 sectors). All the seagate ones I
have makes a device pause directly after the first sector transfered.
Have you any idea of the device behaviour ?
Why does the device make some pause ? Why is it different, depending of
the brand name ?
Is there a way to avoid device pause ?
Thanks a lot for your help.
Stephane.
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