-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]] On Behalf Of
L.V.Gandhi
Sent: Sunday, September 08, 2002 6:56 AM
To: [EMAIL PROTECTED]
Subject: [LIH] Harddisk questions
DMA is good for faster memory transfer. In fact that is the entire
purpose of the DMA.
I don't understand why enabling it should be a problem ?
The trouble comes when it is not controlled by the native DMA controller
of the device but by software interrupts which may or may not damage the
storage device.
Anyhow I was told that utilities like "hdparm" can be harmful if always
enabled.
Reason being that the drive manufacture does not furnish device details
and hence using "hdparm" can be risky.
How to know whether enabling dma is OK for a harddisk?
I have two harddisks
one Seagate 20 gb ata 100
other Samsung 40 gb ata 33
The Samsung hard disk should also be ATA 100. I am not able to
understand why it is only ATA 33.
Maybe you should get an 80 conductor cable. Then it might change to ATA
100.
What will the effect ata value on data transfer?
The ATA value tells us the rate of transfers which are accomplished.
ATA 33 would mean that it would have a "peak" of 33Mbps though most of
the time it never achieves this rate.
Likewise ATA 100 would imply a data rate transfer of upto 100 Mbps etc.
Hope this answers all your questions.
Best regards
Tom !
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