I'm running Windows 10 Insider Edition on my customized, high-performance HP Z420v2 motherboard. I switched to AHCI only, was running RAID & AHCI. When I made this switch I was able to get three drives recognized by my motherboard, one of those drives being my Optical DVD/CD/Blu-ray player. I want to be able to run a fourth Solid State Drive but so far the fourth drive isn't recognized, it just doesn't show up either in the BIOS/Setup, Windows File Explorer, or in AOMEI Partition Master software. Is there a theoretical limit as to the number of drives the HP Z420v2 system will recognize, without moving to RAID? Thanks in advance.
DGroves: thank you for your quick response and helpful information. I switched back and forth from AHCI to Raid + AHCI and it didn't seem to make any difference regarding the recognition of additional hard drives or benchmark scores. I have since been able to connect 3 internal SATA SSD's, one M.2 NVMe SSD on a PCIe adapter card, and the Optical drive. Somehow, by magic I guess the additional hard drives were recognized and operating well. The SATA data cable I was using seems to be working fine and the HP 1TB SATA drive it is connected to works well with a decent AS SSD benchmark. I'm still perplexed regarding where to place the three cards in the 6 slots. I need Slot 2 for the EVGA GTX 1080ti graphics card, Slot 4 for the PCIe adapter card, Slot 5 for the Soundblaster card. The PCIe Adapter card is right up against the wide EVGA graphics card. Since it has two fans the PCIe Adapter card restricts cooling so I may be forced to go with the ASUS 1080ti card, which uses a single Blower Type fan at the rear of the card. While this is an additional expense I didn't plan on I may not have a choice. Other than that, the system performs extremely well with knock-out benchmarks. The next system will be based on the HP Z440, which will allow me to boot directly from the M.2 NVMe SSD and use DDR4 RAM.
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