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linux kernel configuration

Linux SATA Drive is Being Displayed as /dev/hda Instead Of /dev/sda

Q. My SATA drive is being displayed as /dev/hda instead of /dev/sda. How do I fix this problem and make sure I get /dev/sda and speed of SATA under Linux operating systems?
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Linux: Find Out If a Particular Driver / Feature Compiled Into Running Kernel or Not

Q. I know how to find out information about compiled driver under FreeBSD kernel. But, how do I find out if a Particular feature, driver or filesystem support is compiled into my running Linux kernel or not? How do I find out if DMA support is compiled into my kernel?
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