Ensure you are using a direct SATA connection. In some cases, specialized PATA-SATA adapters may be required for specific "technological modes".
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The most reliable method for an "unresponsive" drive involves putting the controller into a "Safe Mode" or "ROM Mode". Open the SSD casing to access the internal PCB. Locate the two-pin service jumper or pads. Ensure you are using a direct SATA connection