In your "foreach my $wmiDiskDrive" loop, first check for 
$wmiDiskDrive->{MediaType}

[download]
to be the type of disk you expect:
From MSDN:

MediaType

Data type: string
Access type: Read-only

Type of media used or accessed by this device. Values are:

"Removable media"
"Fixed hard disk"
"Unknown"

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In reply to Re: Floppy Drive Problems by NetWallah
in thread Floppy Drive Problems by slloyd

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