cgsecurity.org

Great!

Well I think I know why Windows is complaining. I don't know why _exactly_ [you can Google it if you want], but when you install Windows 7 on a disk it does so in two partitions, not one. Since you only have one, it fails to install.
Try this:
Remove that 400GB partition. Either via Linux ...

It kind of sounds like your second external has a fault SATA-cable or something?

Anyway, about "Bad starting sector, no partitions bootable". I assume that your external drive doesn't contain a host operating system in which case you should not care about the boot sector? You do care about the ...

I immediately got worried when I read "clean". From the manual, you can read about the command:
https://technet.microsoft.com/en-us/library/cc766465(v=ws.10).aspx
Removes any and all partition or volume formatting from the disk with focus. On master boot record (MBR) disks, only the MBR partitioning ...

Hello,

I had "one of those days" where I selected the wrong drive in Windows Disk Management and thus accidentally did an "Initialize" and file system quick format of a TrueCrypt encrypted non-system disk.

Context:
4TB non-system drive, full drive encrypted via TrueCrypt (thus Windows says "please ...