Hello,my Seagate HDD is showing Cyclic redundancy check error and is not opening
The most common cause of crc's is the data cable. Replace it with a new one, the few dollars spent will save a lot of time and grief. Do this first, trying to recover data over a bad cable is gambling with your data.
You can run checkdisk to clean up the problem, but you will lose all corrupt data-(text is recoverable from the chk files made). As said above, change cable, attempt data recovery, then run checkdisk to recover the hd.
In the command prompt, type chkdsk D: /r (Use whatever drive letter you can't open instead of D: )
System may report it needs to reboot to perform full clean, and it may take quite a while to complete, so enjoy a break