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The description of the issue suggests that your drive's configuration does not support TRIM. We know that the Intel® SSD 730 supports TRIM (optimizer), so this is probably due to the storage controller. Here are some actions that may help:
1. Checking the Asrock Z97 Extreme4 User Manual, the ports SATA3_A0 and SATA3_A1 are handled by an ASMedia ASM1061 Storage controller, not by the Intel® Z97. Please review the user guide and make sure that the storage controller is set to AHCI mode, then try running the optimizer again.
2. Contact Asrock Support and make sure you are using the recommended drivers for the Asmedia SATA controller.
3. Try connecting the drives to the Intel® Z97 SATA ports (SATA3_0 - SATA3_5) and check if the issue is solved.
Please let us know the results after each step, or in case you require further details about this.
Thank you very much Jonathan,
The issue as you surmised was that the first 2 SATA ports on the ASROCK Z97 Extreme 4 are not Intel Z97 ports. I changed the drives to the Intel ports, had to reset the BIOS for some reason and then computer booted and the SSD Toolbox successfully optimized the SSDs.
Thank you again for your fast and excellent help!