How to read and recover data from laptop harddisk with parameter incorrect CRC error?
My dell inspiron 320 gb SATA on Vista OS (5v 1a) was working fine. All of sudden there was too much hardisk activity (continuous light) and PC hanged. I restarted It and it kept on starting windows and then booted itself and came to a dos message that the OS is not present. Select OS drive letter and press enter.
I reset once more and it started vista but didn't go to start screen - it encounter a blue screen for a fraction of a second and booted again. During further trials it went as far as the login screen and when shutdown took over an hour.
I tried later to access it via same laptop, via external drives and external enclosures for SATA. Drive letter appears but no further activity. When try to access drive either it says the drive is not formatted or parameter is not correct or data error (CRC).
I think once it is detented fully/readable, data transfer shouldn't be a problem but I am not reaching to that stage.
Please help me recover data!!

I would remove the hard drive and use one of those 2.5" hard drive enclosures to read the hard drive from another computer. Recover the data then try a chdsk with all the parameters selected.