Hi my name is ***** ***** I will be the expert working with you today to help and resolve the problem you have posted.
I am sorry to hear that you are having such trouble. I will try my best to help you out and resolve the problem as quick as possible.
if the hard drive is dead you cannot boot that means you cannot retrieve the data till you opt for a data recovery service.
Data recovery service has special tools the can retrieve your data using there recovery software if the media is good and if the media is bad they will try the hardware pcb replacement and then they can retrieve it.
There is no way you can do that your primary drive is dead and you will have to use a bootable drive to boot first and then you can connect the bad drive to the secondary sata port to check if the secondary driver is getting detected by the computer or not and if yes then you can get into the disk management and access the drive content.
you can boot from the external drive but you will not be able to check if your internal drive as its set to sata 0 and by default the hardware is set to first boot device so in that case the himem.sys which is a system file will not recognize the internal drive as a C which is the primary drive in this case you will have to remove the bad drive connect it to sata 2 and try booting from the external drive and if the drive is good you will be able to view it on the disk management screen in windows.
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