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M901
,* If you find that the SSD is not working properly, it is possible that the power supply of SSD is not enough, then you need to check the current requirement of your SSD to decide whether power the SSD separately.
* The M901 hardware has no limit on NVME SSD capacity, which is dependent on the Raspberry Pi OS.
==Test Reviews==
By default the PCIe connector is not enabled. To enable it you should add the following option into <span class="tb_blue">/boot/firmware/config.txt</span> and <span class="tb_blue">reboot</span>:
sudo nano /boot/config.txt
Then add the following comment;
# Enable the PCIe External connector.
dtparam=pciex1
# This line is an alias for above (you can use either/or to enable the port).
dtparam=nvme
Press '''Ctrl-O''', then enter, to write the change to the file.
Press '''Ctrl-X''' to exit nano (the editor).
And the connection is certified for Gen 2.0 speed (5 GT/sec), but you can force it to Gen 3.0 (10 GT/sec) if you add the following line after:
dtparam=pciex1_gen=3
You also can refer to official documentatio:[https://www.raspberrypi.com/documentation/computers/raspberry-pi-5.html#enabling-pcie Enabling PCIe]
After I forced Gen 3.0 speeds, in my many tests I found that some NVMEs were able to run stably, but some NVMEs caused some problems: such as slow startup and running laggy, really really laggy. As the official statement says:
The Raspberry Pi 5 is not certified for Gen 3.0 speeds, and connections to PCIe devices at these speeds may be unstable.
'''Run the following command on Teminal window to test:'''
dd if=/dev/zero of=./Testingfile bs=100M count=10 oflag=direct
dd if=./Testingfile of=/dev/zero bs=100M count=10 oflag=dsync
'''Nomral PCIE 2.0 test data with''' ''dd'' '''command;'''
[[File:Nvme-test(pcie2).png]]
'''Forced Gen 3.0 speeds test data with '''dd''' command:'''
[[File:Nvme-test(pcie3).png]]
==Packing List==