Not able to boot from 1 TB w8 HDD.

I have 1 TB HDD having w8
I have another 40GB HDD having w7.

When 1 TB HDD is selected as first hdd to boot from, it doesn't boot. There is some error message right at the start and nothing proceeds.

When 40 GB HDD is selected as first hdd to boot from, it duly proceeds to boot from w8, it shows w8/w7 boot choice, on selecting w8 (that is default also), it proceeds to boot w8. No problem. On selecting w7, it reboots and starts w7. No problem here also.

I am wondering why it goes to boot from 40 GB hdd and why can't it boot from 1 TB HDD?

How can I remedy it with EasyBCD so that it boots into w8 from 1 TB HDD.
EasyBCD shows the following
-
There are a total of 2 entries listed in the bootloader.

Default: Windows 8
Timeout: 8 seconds
Boot Drive: D:\

Entry #1
Name: Windows 8
BCD ID: {current}
Drive: C:\
Bootloader Path: \Windows\system32\winload.exe

Entry #2
Name: Windows 7
BCD ID: {ca99d00f-2ba6-11e2-89ba-942ec86653f3}
Drive: D:\
Bootloader Path: \Windows\system32\winload.exe
-

Thanks.
--
Rawat