Hi there!

I have the following problem. I develop FPGA IP core for ATA HDD. I
have tested it on 40 GB 2.5" Fujitsu HDD. PIO and Ultra DMA operated
fine. When I switched to Maxtor DiamondMax HDD (3.5" 60 and 200 GB) it
was found out that after I perform Ultra DMA write operation (DMA
Write) I get different results using PIO and Ultra DMA read:
- if I read sector using Ultra DMA commands (DMA Read), I get data
which was written earlier using PIO write commands (Write Sector) not
written by 	Ultra DMA write commands.
- if I read sector using PIO command (Read Sector), I get data which
was written by Ultra DMA write command. The strange thing is that if I
read the same sector again using PIO command, I get data which was
written earlier using PIO write commands.

What can be the problem?
I have tried to turn off cache and read-ahead options but it didn't
help.
Thanks in advance.

Eug

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