Some experimentation on my Dell Inspiron 530 shows the following:

Booting with controller set to RAID mode:
   - boots OK without the need for the all_generic_ide parameter
   - read speed: 64.0 MB/s
   - write speed: 51.4 MB/s

Booting with controller set to IDE mode:
   - requires all_generic_ide boot parameter to boot correctly
   - read speed: 65.0 MB/s
   - write speed: 51.1 MB/s

Read/Write tests performed on an ext3 journaled file system with a 4 Gb
file using dd - I suspect if I was to repeat these tests more
scientifically on a raw device the figures between IDE and RAID will be
small and insignificant.

I recommend setting the BIOS to RAID mode just so that one does not need
the "all_generic_ide" boot option

-- 
Dell Inspiron 530 SATA drive not detected in IDE mode
https://bugs.launchpad.net/bugs/153702
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