Add a hashtable to another hashtable

Question

Function HDD_Information($Output)
$Server = $Output.Server
$Output1 = @{};
$HDDInfor = gwmi win32_diskdrive -ComputerName $Server -EA stop
Foreach ($HDD in $HDDInfor)
$Output."Size" = $HDD.Size
$Output."Model" = $HDD.Model
$Output1.Add($Output)
return $Output1
I am trying to add a hashtable to another hastable, but i get an error  :- 
Cannot find an overload for "Add" and the argument count: "1"
+                 $Output1.Add <<<< ($Output)
    + CategoryInfo          : NotSpecified: (:) [], MethodException
    + FullyQualifiedErrorId : MethodCountCouldNotFindBest
First Hashtable = $Output 
The $Output variable contains the follwing values
@{Model=VMware Virtual disk SCSI Disk Device; Size=12231242555}
@{Model=VMware Virtual disk SCSI Disk Device; Size=84853845435546}
Second Hashtable = $Output1
So When the function returns 2 values, the script enters only one value in the csv file.. I want to save both the values in a hashtable and enter into the csv. Have got the csv part all figured out, just
having problem adding both the return values in CSV.
Any help is appreciated!

Answer 1

I hear you. my code is wrong..
Now since all of my servers have 2 physical disks...
gwmi win32_diskdrive -ComputerName $Server -EA stop
|select Size, Model
This command returns 2 values .. one value for physical
0 and another value for physical 1..my code is designed to work with only 1 value.
How do i make it work for 2 values and feed it into
CSV.
gwmi win32_diskdrive -ComputerName $Server |select Size,
Model | Export-Csv myfile.csv -NoType
¯\_(ツ)_/¯