@Darknez,
Sorry, I don't read German. So, I can't help you more.
May be any internet security/antivirus/antimalware application conflicting ?

I haven't read the thread completely..

There are official Samsung drivers for the SM951 NVMe, but are there drivers for the SM951 AHCI as well?

for SM951 AHCI device you use automatically W10 AHCI native driver. Samsung proprietary driver is for NVMe technology only.

Zitat von Fernando im Beitrag #63

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AHCI and NVMe are completely different data transfer protocols.
Samsung doesn't offer any specific AHCI driver for their PCIe/M.2 connected AHCI SSDs. The only available AHCI driver for such SSDs is the Win10 in-box MS AHCI driver.

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Zitat von 100PIER im Beitrag #64

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for SM951 AHCI device you use automatically W10 AHCI native driver. Samsung proprietary driver is for NVMe technology only.

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Hi Fernando,

I'm sorry, but i am pretty sure you are wrong. I have installed two Samsung SM951. If i remove them, the disk drives disappear, and so do the IDE ATA/ATAPI Controllers. When i reinstall them, both Disk Drives and both IDE ATA/ATAPI Controllers re-appear. The third IDE ATA/ATAPI Controller is my Intel SATA onboard chipset by the way. Here is the Hardware ID:



Have a look by yourself:

https://pcisig.com/membership/member-companies?combine=144d

https://www.google.de/search?q=VEN_144D%26DEV_A801

You wrote:

Zitat von Fernando im Beitrag #66

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The listed "Disk Drives" have nothing to do with the listed "IDE ATA/ATAPI Controllers".

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@Fernando:

i was not about giving a lesson, i was trying to make things absolutely clear, since it looked like that we misunderstood each other. Also, maybe other people are reading this some day, who are new to this topic. I think it's never a bad idea to sum up informations, that's why i posted the typed at the end of my last post.

Regarding your answer:

1. Every disk has it's very own logical and physical existing controller which requires a driver, no matter if HDD or SSD. Even USB Sticks have a own Controller. They are the "interface" between the connection-link of the system (for example SATA or USB) and the memory media itself (Head+HDD Platter, NAND flash chips). You cannot connect a spinning HDD platter to a PCI Express lane. There is a chip which controlls every read and write access, and executes every ATA command. In case of a HDDs for example it automaticly fixes issues regarding bad sectors. In SSD cases, this controller cares about wear leveling, and communication between to all NAND chips if multiple are placed on the PCB. This controller of course does exist, but no special driver is necessary, so a windows default driver is doing a good job here. The software driver for the drive controller manages, for example, if you want to use the xx Megabyte cache which is built-in the drive.

2. Since SATA is a good example lets continue here: The controller on the disk which can speak the SATA protocoll cannot be directly connected to the CPU or North-/Southbridge. Therefore another controller is necessary. A SATA controller. This controller does the conversion from a system link (like PCI Express) to SATA. These types of controllers often work more performant if you use the vendor provided driver, like intel rapid storage driver. For example, in the beginning of the SSD era, the windows default driver was not TRIM capable, that's why the intel driver was a better choice. Hint: the SATA controller is physically integrated inside the South-/Northbridge these days.

In case of the SM951 the explained 1. and 2. controllers are both placed on the SM951 PCB. Maybe they are physically one Chip (i didn't check that), but logically they are definitely two different controllers, which both require a separate driver. And: both controllers on the SM951 are technically SATA class devices.

I know that they are managed by completely different drivers. I didn't say otherwise. A special driver for the disk itself is not necessary. As i said above, the windows default driver is doing a good job here. But i can imagine that there is a better driver for SATA Controller than the Windows default driver. That's why i asked for a driver in #62.

I drew a picture with a HDD as example to make it clear for everyone:

@Fernando

ATA Packet Interface (ATAPI) is a protocol that has been added to Parallel ATA and Serial ATA:
https://en.wikipedia.org/wiki/ATA_Packet_Interface

But you are right, in this case AHCI is spoken over this physical SATA Interface. I'm sorry for that, let me correct my sentence:

Zitat

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The controller on the disk which can speak the SATA protocoll cannot be directly connected to the CPU or North-/Southbridge.

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Zitat

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The controller on the disk which can speak the AHCI protocoll over the SATA interface cannot be directly connected to the CPU or North-/Southbridge.

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Actually i wasn't wrong, since AHCI is a SATA Protocoll - a protocoll for the SATA interface.

However, do you still believe a disk controller does not exist?
This discussion has indeed nothing to do with this topic anymore. My original question was, if there are special drivers for the SM951 AHCI as well, and by that i meant the integrated SATA Controller.

I found a driver for VEN_144D&DEV_A801, but i have not tried it yet:
https://www.lacie.com/de/de/support/mobi...-thunderbolt-2/

It says thunderbold, but thunderbold carries the PCI Express protocoll, so i guess it's technically the same.

@Lebedev There is a problem with your "SATA controller on SM951 PCB" theory :
There are no SATA specs for over 600MB/s transfers.
SM951 type drive (regardless of protocol used or capacity) can do 2GB/s Reads, and 128GB model contains two memory chips/ICs on it's PCB.
That's WAY beyond any SATA device can do in theory - which means, those SM951 drives are NOT SATA devices, and they cannot contain/utilise any SATA related hardware.

Both SATA and PCI-e drives can use AHCI protocol, however that's end of similarities between them.
In short : It's a square and a rectangle type of stuff (SATA == AHCI or "IDE" or RAID, AHCI =/= SATA).

You could try using a universal AHCI driver... however, it may not work with M.2 drives.
Example : http://alter.org.ua/soft/win/uni_ata/

PS. If using AHCI M-key M.2 was so easy, I woudn't have to use Clover/DUET to boot from it on legacy hardware (which supports SATA booting from PCI-e add-on cards since 2004/2005) :)