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I am constantly getting this in the terminal. What is the reason for this.
This is a fresh install from nanopi-duo_ubuntu-core-xenial_4.11.2_20170908.img.zip


root@NanoPi-Duo:~# [ 183.243424] sd 0:0:0:0: timing out command, waited 180s
[ 363.184929] sd 0:0:0:0: timing out command, waited 180s
[ 543.161443] sd 0:0:0:0: timing out command, waited 180s
[ 723.223300] sd 0:0:0:0: timing out command, waited 180s
[ 903.230300] sd 0:0:0:0: timing out command, waited 180s
[ 903.235937] sd 0:0:0:0: [sda] Asking for cache data failed
[ 903.241742] sd 0:0:0:0: [sda] Assuming drive cache: write through
[ 1083.322172] sd 0:0:0:0: timing out command, waited 180s
[ 1263.381305] sd 0:0:0:0: timing out command, waited 180s
[ 1263.389294] sd 0:0:0:0: timing out command, waited 30s
[ 1443.434428] sd 0:0:0:0: timing out command, waited 180s
[ 1623.402308] sd 0:0:0:0: timing out command, waited 180s
[ 1803.413176] sd 0:0:0:0: timing out command, waited 180s
[ 363.184929] sd 0:0:0:0: timing out command, waited 180s

Looks like a bad or really slow MicroSD-Card.
Which card you you use? Brand? Speed?
Iam using a Sandisk Ultra 16GB , Speed: Class 10, 80MB/sec (grey/red - the white/red has only 48MB/sec)

[EDIT]:
Now I also see what you mean - I got this also showing up via dmesg:

[290602.875821] sd 0:0:0:0: timing out command, waited 20s
[290622.886702] sd 0:0:0:0: timing out command, waited 20s
[290667.087432] sd 0:0:0:0: timing out command, waited 20s
[290687.099332] sd 0:0:0:0: timing out command, waited 20s
[290723.810697] sd 0:0:0:0: timing out command, waited 20s
[290743.831691] sd 0:0:0:0: timing out command, waited 20s
[290780.202069] sd 0:0:0:0: timing out command, waited 20s
[290800.212946] sd 0:0:0:0: timing out command, waited 20s
[290844.015456] sd 0:0:0:0: timing out command, waited 20s
[290864.025444] sd 0:0:0:0: timing out command, waited 20s
[290899.947581] sd 0:0:0:0: timing out command, waited 20s
[290919.977699] sd 0:0:0:0: timing out command, waited 20s

BUT after a fresh reboot I got the following messages:
[ 3.152268] sd 0:0:0:0: [sda] Unit Not Ready
[ 3.156667] sd 0:0:0:0: [sda] Sense Key : 0x4 [current]
[ 3.161988] sd 0:0:0:0: [sda] ASC=0x44 <<vendor>>ASCQ=0x81
[ 183.180528] sd 0:0:0:0: timing out command, waited 180s
root@NanoPiDuo:~# dmesg -w|grep 'sd 0:0:0:0'
[ 3.152268] sd 0:0:0:0: [sda] Unit Not Ready
[ 3.156667] sd 0:0:0:0: [sda] Sense Key : 0x4 [current]
[ 3.161988] sd 0:0:0:0: [sda] ASC=0x44 <<vendor>>ASCQ=0x81
[ 183.180528] sd 0:0:0:0: timing out command, waited 180s
[ 363.229656] sd 0:0:0:0: timing out command, waited 180s
[ 543.244787] sd 0:0:0:0: timing out command, waited 180s
[ 543.250393] sd 0:0:0:0: [sda] Read Capacity(10) failed: Result: hostbyte=0x00 driverbyte=0x08
[ 543.250468] sd 0:0:0:0: [sda] Sense Key : 0x4 [current]
[ 543.250532] sd 0:0:0:0: [sda] ASC=0x44 <<vendor>>ASCQ=0x81
[ 543.250620] sd 0:0:0:0: [sda] 0 512-byte logical blocks: (0 B/0 B)
[ 543.250670] sd 0:0:0:0: [sda] 0-byte physical blocks
[ 723.289783] sd 0:0:0:0: timing out command, waited 180s
[ 723.295352] sd 0:0:0:0: [sda] Test WP failed, assume Write Enabled
[ 903.334026] sd 0:0:0:0: timing out command, waited 180s
[ 903.339572] sd 0:0:0:0: [sda] Asking for cache data failed
[ 903.345385] sd 0:0:0:0: [sda] Assuming drive cache: write through
[ 903.387067] sd 0:0:0:0: [sda] Unit Not Ready
[ 903.387195] sd 0:0:0:0: [sda] Sense Key : 0x4 [current]
[ 903.387389] sd 0:0:0:0: [sda] ASC=0x44 <<vendor>>ASCQ=0x81
[ 1083.400648] sd 0:0:0:0: timing out command, waited 180s
[ 1263.451276] sd 0:0:0:0: timing out command, waited 180s
[ 1263.461194] sd 0:0:0:0: timing out command, waited 30s
[ 1443.468392] sd 0:0:0:0: timing out command, waited 180s
[ 1443.473824] sd 0:0:0:0: [sda] Read Capacity(10) failed: Result: hostbyte=0x00 driverbyte=0x08
[ 1443.473860] sd 0:0:0:0: [sda] Sense Key : 0x4 [current]
[ 1443.473891] sd 0:0:0:0: [sda] ASC=0x44 <<vendor>>ASCQ=0x81
[ 1623.504763] sd 0:0:0:0: timing out command, waited 180s
[ 1803.541287] sd 0:0:0:0: timing out command, waited 180s
[ 1803.546926] sd 0:0:0:0: [sda] Attached SCSI disk

Hmmmm... whats that?

Dont know what there timed out before

I am using a SanDisk Ultra 16GB Class 10. Have tried 2 different ones, with same issues.

mikemoy wrote:
I am constantly getting this in the terminal. What is the reason for this.
This is a fresh install from nanopi-duo_ubuntu-core-xenial_4.11.2_20170908.img.zip


root@NanoPi-Duo:~# [ 183.243424] sd 0:0:0:0: timing out command, waited 180s
[ 363.184929] sd 0:0:0:0: timing out command, waited 180s
[ 543.161443] sd 0:0:0:0: timing out command, waited 180s
[ 723.223300] sd 0:0:0:0: timing out command, waited 180s
[ 903.230300] sd 0:0:0:0: timing out command, waited 180s
[ 903.235937] sd 0:0:0:0: [sda] Asking for cache data failed
[ 903.241742] sd 0:0:0:0: [sda] Assuming drive cache: write through
[ 1083.322172] sd 0:0:0:0: timing out command, waited 180s
[ 1263.381305] sd 0:0:0:0: timing out command, waited 180s
[ 1263.389294] sd 0:0:0:0: timing out command, waited 30s
[ 1443.434428] sd 0:0:0:0: timing out command, waited 180s
[ 1623.402308] sd 0:0:0:0: timing out command, waited 180s
[ 1803.413176] sd 0:0:0:0: timing out command, waited 180s
[ 363.184929] sd 0:0:0:0: timing out command, waited 180s

Hi，
What type of SD card do you use?

Thanks！

The problem is that there is no mSATA card installed. That is why we are getting these warnings.
Once you stick a mSATA card it they stop. I don't know why they have not done something about it so people can use it without so they dont get the terminal filled up with this information when its useless.