Trying to restore Time Mach Backup

Hi



Lost my HD a few weeks back and now I'm trying to restore a Time Machine backup using Migration Assistant.



I have 2 external discs, one has the time machine backups.



When I select the option from a time mach backup the next window shows 3 disks, all are named the same and look the same.



I have a Lacie 1TB and WD 1TB external and a W/D 1TB in the computer.



How do I tell which disc to select for the T/M back up?



Thanks..

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