function ConvertTo-Byte()
{
    param(
       [single]$Value,
       [string]$Unit
    );

    switch ($Unit) {
        { 'B', 'Byte' -contains $_ } { $result = $Value; $boolOption = $true; }
        { 'KB', 'KiloByte' -contains $_ } { $result = ($Value * [math]::Pow(10, 3)); $boolOption = $true; }
        { 'MB', 'MegaByte' -contains $_ } { $result = ($Value * [math]::Pow(10, 6)); $boolOption = $true; }        
        { 'GB', 'GigaByte' -contains $_ } { $result = ($Value * [math]::Pow(10, 9)); $boolOption = $true; }
        { 'TB', 'TeraByte' -contains $_ } { $result = ($Value * [math]::Pow(10, 12)); $boolOption = $true; }
        { 'PT', 'PetaByte' -contains $_ } { $result = ($Value * [math]::Pow(10, 15)); $boolOption = $true; }
        default { 
                if (-Not $boolOption) {
                        Throw 'Invalid input';
                } 
        }
    }

    return $result;
}
function ConvertTo-KiloByte()
{
    param(
        [single]$Value,
        [string]$Unit
    );

    switch ($Unit) {
        { 'B', 'Byte' -contains $_ } { $result = ($Value / [math]::Pow(10, 3)); $boolOption = $true; }
        { 'KB', 'KiloByte' -contains $_ } { $result = $Value; $boolOption = $true; }
        { 'MB', 'MegaByte' -contains $_ } { $result = ($Value * [math]::Pow(10, 3)); $boolOption = $true; }        
        { 'GB', 'GigaByte' -contains $_ } { $result = ($Value * [math]::Pow(10, 6)); $boolOption = $true; }
        { 'TB', 'TeraByte' -contains $_ } { $result = ($Value * [math]::Pow(10, 9)); $boolOption = $true; }
        { 'PT', 'PetaByte' -contains $_ } { $result = ($Value * [math]::Pow(10, 12)); $boolOption = $true; }
        default { 
                if (-Not $boolOption) {
                        Throw 'Invalid input';
                }  
        }
    }
    
    return $result;
}

function ConvertTo-MegaByte()
{
    param(
        [single]$Value,
        [string]$Unit
    );

    switch($Unit) {
        { 'B', 'Byte' -contains $_ } { $result = ($Value / [math]::Pow(10, 6)); $boolOption = $true; }
        { 'KB', 'KiloByte' -contains $_ } { $result = ($Value / [math]::Pow(10, 3)); $boolOption = $true; }
        { 'MB', 'MegaByte' -contains $_ } { $result = $Value; $boolOption = $true; }       
        { 'GB', 'GigaByte' -contains $_ } { $result = ($Value * [math]::Pow(10, 3)); $boolOption = $true; }
        { 'TB', 'TeraByte' -contains $_ } { $result = ($Value * [math]::Pow(10, 6)); $boolOption = $true; }
        { 'PT', 'PetaByte' -contains $_ } { $result = ($Value * [math]::Pow(10, 9)); $boolOption = $true; }
        default { 
                if (-Not $boolOption) {
                     Throw 'Invalid input';
                } 
        }
    }
    
    return $result;
}

function ConvertTo-GigaByte()
{
    param(
        [single]$Value,
        [string]$Unit
    );

    switch($Unit) {
        { 'B', 'Byte' -contains $_ } { $result = ($Value / [math]::Pow(10, 9)); $boolOption = $true; }
        { 'KB', 'KiloByte' -contains $_ } { $result = ($Value / [math]::Pow(10, 6)); $boolOption = $true; }
        { 'MB', 'MegaByte' -contains $_ } { $result = ($Value / [math]::Pow(10, 3)); $boolOption = $true; }
        { 'GB', 'GigaByte' -contains $_ } { $result = $Value; $boolOption = $true; }
        { 'TB', 'TeraByte' -contains $_ } { $result = ($Value * [math]::Pow(10, 3)); $boolOption = $true; }
        { 'PT', 'PetaByte' -contains $_ } { $result = ($Value * [math]::Pow(10, 6)); $boolOption = $true; }
        default { 
                if (-Not $boolOption) {
                        Throw 'Invalid input';
                }  
        }
    }
    
    return $result;
}

function ConvertTo-TeraByte()
{
    param(
        [single]$Value,
        [string]$Unit
    );

    switch($Unit) {
        { 'B', 'Byte' -contains $_ } { $result = ($Value / [math]::Pow(10, 12)); $boolOption = $true; }
        { 'KB', 'KiloByte' -contains $_ } { $result = ($Value / [math]::Pow(10, 9)); $boolOption = $true; }
        { 'MB', 'MegaByte' -contains $_ } { $result = ($Value / [math]::Pow(10, 6)); $boolOption = $true; }
        { 'GB', 'GigaByte' -contains $_ } { $result = ($Value / [math]::Pow(10, 3)); $boolOption = $true; }
        { 'TB', 'TeraByte' -contains $_ } { $result = $Value; $boolOption = $true; }
        { 'PT', 'PetaByte' -contains $_ } { $result = ($Value * [math]::Pow(10, 3)); $boolOption = $true; }
        default { 
                if (-Not $boolOption) {
                        Throw 'Invalid input';
                }  
        }
    }
    
    return $result;
}

function ConvertTo-PetaByte()
{
    param(
        [single]$Value,
        [string]$Unit
    );

    switch($Unit) {
        { 'B', 'Byte' -contains $_ } { $result = ($Value / [math]::Pow(10, 15)); $boolOption = $true; }
        { 'KB', 'KiloByte' -contains $_ } { $result = ($Value / [math]::Pow(10, 12)); $boolOption = $true; }
        { 'MB', 'MegaByte' -contains $_ } { $result = ($Value / [math]::Pow(10, 9)); $boolOption = $true; }
        { 'GB', 'GigaByte' -contains $_ } { $result = ($Value / [math]::Pow(10, 6)); $boolOption = $true; }
        { 'TB', 'TeraByte' -contains $_ } { $result = ($Value / [math]::Pow(10, 3)); $boolOption = $true; }
        { 'PT', 'PetaByte' -contains $_ } { $result = $Value; $boolOption = $true; }
        default { 
                if (-Not $boolOption) {
                        Throw 'Invalid input';
                }  
        }
    }
    
    return $result;
}