Nested PDO queries - php

Question

I've run into some trouble trying to execute MSSQL queries using PDO.
I have a table called Computer with 92 computers listed. They all have a respective ID 1-92.
I am using the query: SELECT * FROM Computer to query the table. I want to add associated information to this query so I am outputting it inside a while-loop (this is eventually for table generation).
$queryDiskOperationLog = "SELECT * FROM Computer";
$queryHDDSResult = $connClient -> prepare($queryDiskOperationLog);
$queryHDDSResult->execute();
$queryDiskOperationLogResult = $connClient -> prepare($queryDiskOperationLog);
while ($rowHDDS = $queryHDDSResult->fetch(PDO::FETCH_ASSOC)) {
echo $rowHDDS['Id'];
}
This output works great. I get 1-92 outputted. Trouble begins when I start adding other queries.
Whenever I add another query inside the while-loop the output of the first query is altered and it only outputs uneven numbers (ie. 1,3,5,7...)
I am using the same PDO::FETCH_ASSOC method to get results from the other query and variable names are distinctly different. Do you know what could cause this?
My final code looks like: (note I don't even echo the second query yet.
$queryDiskOperationLog = "SELECT * FROM Computer";
$queryHardDisk = "SELECT * FROM HardDisk";
$queryHDDSResult = $connClient -> prepare($queryDiskOperationLog);
$queryHDDSResult->execute();
$queryHardDiskResult = $connClient -> prepare($queryHardDisk);
$queryHardDiskResult ->execute();
$queryDiskOperationLogResult = $connClient -> prepare($queryDiskOperationLog);
while ($rowHDDS = $queryHDDSResult->fetch(PDO::FETCH_ASSOC)) {
$rowHardDisk = $queryHardDiskResult->fetch(PDO::FETCH_ASSOC);
echo $rowHDDS['Id'];
}