Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.
These interpretations seem to disagree with the HGST 7K4000 data sheet linked to the original post. I've uploaded the data sheet to MediaFire, in case HGST changes it, making this post incomprehensible.
The data sheet does say that the 'ALE640 is 512e and the 'ALA640 is 512n. But the data sheet...