Accessing elements of hashtable, what am I doing wrong?

hello,

i have hashtable of hashtable $a. want format information both freespacenow , originalfreespace appearing values in table , having hard time understanding going on output

ps c:\users\gs> $a    name                           value  ----                           -----  d:                             {freespacenow, originalfreespace}  c:                             {freespacenow, originalfreespace}

if format output below output not change @ regardless put after "select" statement, no errors no change in output, why that?

ps c:\users\gs> $a | select  $_.namsdfdsf    name                           value  ----                           -----  d:                             {freespacenow, originalfreespace}  c:                             {freespacenow, originalfreespace}  

secondly how achieve put both numbers in table? 

ps c:\users\gs> $a | select $_.sad ,  @{n= "dd"; e = $_.item["freespacenow"]}  [ : cannot index null array.  @ line:1 char:46  + $a | select $_.sad ,  @{n= "dd"; e = $_.item[ <<<< "freespacenow"]}      + categoryinfo          : invalidoperation: (freespacenow:string) [], runtimeexception      + fullyqualifiederrorid : nullarray  

i see.  have hashtable of hashtables; can work that.  enumerate items in hashtable (in powershell), have call getenumerator() method explicitly, or use keys or values properties (getenumerator() more efficient option).  when that, list of keyvaluepair objects key , value properties (key "c:" or "d:" drive letter, , value refer inner hashtable contains freespacenow , originalfreespace keys).  example:

$a.getenumerator() | select-object -property @(     @{ name = 'driveletter'; expression = { $_.key } }     @{ name = 'freespacenow'; expression = { $_.value['freespacenow'] } }     @{ name = 'originalfreespace'; expression = { $_.value['originalfreespace'] } } ) 

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