Cannot dual-boot windows 7 on 1tb SSHD

Hello
Till date I always had Win 7 in 32 & 64 bit flavors and occasionally also xp.

Recently I got a 1 tb seagate firecuda and installed win 7 64 bit. However, the 2nd install of the same flavor was awkward (in the first install, after expanding files windows rebooted) because it completed all tasks before rebooting.

However, when I tried booting from the newer install, I saw the dreaded message "cannot load winload.exe"

I deleted that install and tried with 32 bit, same result.

Tried Xp too, same result.

I even deleted all installs and had 32 bit first, then 64 bit, same result.

Currently I am using the 32 bit and typing from there.

Is this how SSHD supposed to behave? I thought the 7gb cache would speed up things, but never expected this.

What may be wrong, any idea? Thanks in advance for any inputs

As a routine I created 4 partitions and after using the first partition, installed on another.

Using another disk does not serve because the cache-benefit for which I purchased the disk, will be nulled.