Adding two HDD

[pluscool]

Hi
I'm following the good instructions to add a hard drive but I'm installing two harddisks at the same time one with data, the other empty (Both SATA 1Tb and 1,5 Tb). After following the instructions I be able to see just one HDD (the one with content)
Amahi storage shows three disks but two of them are repeated (the one with content)

what i'm doing wrong? Thanks for any ideas!

[cpg]

It's hard to tell what's going on. can you provide more detail, like the output of

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df

and

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mount