
BOTH drives had problems preventing or severely delaying my PC's Windows from booting. I believe they have been overused to write large amounts of discs and the optical readers are failing due to this overuse so they can't "see" if the disc is in the drive and so they keep looking to find it . One of the drives had poor bearings and vibrated loudly when revved up, which was also a clear sign of excessive wear. How they could be offered as "unused" with such obvious signs of excessive wear shows ignorance or fraud; (The drive cases also showed signs of being installed and removed, confirming other signs of use and wear.) These drives are NOT as described and should not be purchased as they did not perform as I expected from an unused and new drive.

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