Can't boot into windows with HDD in optical bay

Hi everyone,

I have a macbook pro 2012 mid 13' which runs on HDD orginally.

I swapped the HDD with SSD. Mac OS was cloned to the SSD and a windows 7 was clean installed using bootcamp. Everything's fine.

Recently I find the optical driver broken, so I take it out and install the old HDD in the optical bay for extra storage.

Suddenly I cannot boot into windows 7, black screen with blinking cursor, while Mac OS remains functional.

If I disconnect the HDD from the optical bay, then I can boot into windows 7 and both systems are fine.

Once I connect the HDD in the optical bay, it won't let me boot into windows again.

Problem remains after formatting the HDD with ExFAT or Mac OS extended, using windows installation to repair things like Bootrec.exe /FixMbr, FixBoot, RebuildBcd does't work either.

diskutil list shows results below, where disk 0 is SSD with windows 7 and Mac OS, disk 1 is HDD.

/dev/disk0 (internal, physical):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *500.1 GB disk0

1: EFI EFI 209.7 MB disk0s1

2: Apple_APFS Container disk2 299.9 GB disk0s2

3: Microsoft Basic Data Winddows 7 200.0 GB disk0s3

/dev/disk1 (internal, physical):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *500.1 GB disk1

1: EFI EFI 209.7 MB disk1s1

2: Microsoft Basic Data HDD 499.2 GB disk1s2

/dev/disk2 (synthesized):

#: TYPE NAME SIZE IDENTIFIER

0: APFS Container Scheme - +299.9 GB disk2

Physical Store disk0s2

1: APFS Volume Macintosh SSD 247.7 GB disk2s1

2: APFS Volume Preboot 21.8 MB disk2s2

3: APFS Volume Recovery 516.1 MB disk2s3

4: APFS Volume VM 8.6 GB disk2s4

diskutil cs list returns "No CoreStorage logical volume groups found".

Even if I connect the broken super driver in optical bay back, both systems on SSD in main bay work perfectly.

Looking forward anyone's help.

Many thanks.

All the best