[SOLVED] SATA & M.2 Lane sharing

ravin_29

Commendable
Mar 24, 2019
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Hi all,
B550M Pro4 asrock board manual has following statement.

M2_2 and SATA3_5_6 share lanes. If either one of them is in
use, the other one will be disabled.
In principle I understand what it means. However what is not clear is if this rule is also applicable for PCIe NVMe SSD because as per manual M2_2 supports either SATA or PCIe

M2_2), supports M Key type 2280 M.2
SATA3 6.0 Gb/s module and M.2 PCI Express module up to
Gen3 x2 (16 Gb/s)
If I install NVMe SSD in M2_2 slot will it still disable SATA 3 5 6 lanes?
Thanks.
 
Jun 18, 2020
24
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Your motherboard shuts down port because you have limitations with the B550 chipset your motherboard manual has shown you which ports are available if you fill all the M.2 slots.

I have an X570 mobo were there are no limitations on any port so I can fill the motherboard on all the slots because of my chipset.

I also have a B450 motherboard which also will shut down 4 sata ports of 6 if I have 2 X M.2 fitted but who needs sata when using M.2 speed ?
 
Last edited:

getochkn

Polypheme
Moderator
I have a B550 Steel Series. Not only does it disable the 3 SATA ports, but the 2nd M2 slot will be Gen 2 speeds, or half. I have a 500GB WD Black in the 2nd port. I get 1600mb/1450mb read/write speeds on it still. My 1TB Sabrent Rocket in the first M2 slot gets 3000mb/2700mb read/write speeds. The 3 SATA ports are filled with a 1TB SSD, a 2TB WD Green (ick) and 1TB Seagate Baracuda that all get their respective speeds. I am maxxed now at 5 drives unless I want to loose the second M2, but meh, I have a 40TB UNRAID tower on my network for any big long term storage.
 

ravin_29

Commendable
Mar 24, 2019
56
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1,530
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Oh! so does it mean that the 3 after SATA is the naming convention of SATA3?
Like SATA1, SATA2 & SATA3?
I thought all SATA 3 5 & 6 ports (3 ports in all) gets disabled. But looks like only 5 & 6 get disabled!
That's bit better. Do confirm. Thanks a lot!
 
Jun 18, 2020
24
2
25
2
Oh! so does it mean that the 3 after SATA is the naming convention of SATA3?
Like SATA1, SATA2 & SATA3?
I thought all SATA 3 5 & 6 ports (3 ports in all) gets disabled. But looks like only 5 & 6 get disabled!
That's bit better. Do confirm. Thanks a lot!
I you have a M.2_2 in use SATA PORTS (3_5) & (3_6) ports will be disabled but you will still have 4 ports available.

So you can use M2_1 & M2_3 without interference to the Sata Ports because it looks like M2_2 goes through the B550 Chipset & M2_1 / M.2_3 go straight to the CPU

The manual does make the numbers seem confusing see below:

These six SATA3
connectors support SATA
data cables for internal
storage devices with up to
6.0 Gb/s data transfer rate.
* M2_2 and SATA3_5_6
share lanes
. If either one
of them is in use, the other
one will be disabled.
 

ravin_29

Commendable
Mar 24, 2019
56
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1,530
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Yes manual is confusing but now if I look at the left side section (see the photo) then the ports are named as SATA3_1, SATA3_2 and in that order upto SATA3_6.
So when they say SATA3_5_6 it must be 5 & 6 only.
Why manuals are not easy to understand?
 

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