How complicated an answer do you want to this question? The default Linux geometry is 255 heads with 63 sectors per track. Windows 7 uses a geometry of 240 heads with 63 sectors per track to accommodate solid state drives. According to Ted Tso the ideal geometry (which I use) is 224 heads with 56 sectors per track since for a solid state drive to work efficiently the partitions need to be aligned on 128k boundaries. It should also be noted that the start of the first partition (or the start of data within it) should be offset to 1024k to take account mis-allignment due to the MBR. This is all vital for correct functioning of solid state drives :) Please also note my launchpad bug #415888. Using ext4 for installation on a solid state drive will cause the install to fail or not work correctly if the drive has an indilinx controller (most do). I think this is because indilinx is not 100% sata compliant. So its best in these circumstances to install using ext3. Rachael -----Original Message----- From: Ralph Ulrich