In Linux NFS mode, when a Board is started, what does/proc/Partitions lose the hard disk?

After a Linux NFS model board is started, sometimes/proc/partitions will lose what the hard disk is, the appearance frequency is low, it will be once a day, usually the first time it is started in the morning
Root $ CAT/proc/Partitions
Major minor # Blocks name

7 0 8192 loop0
31 0 2048 mtdblock0
31 1 4096 mtdblock1
31 2 10240 mtdblock2
Normal
Root $ CAT/proc/Partitions
Major minor # Blocks name

7 0 8192 loop0
31 0 2048 mtdblock0
31 1 4096 mtdblock1
31 2 10240 mtdblock2
8, 0, 1953514584, SDA

8 1 1953512001 sda1

Sata_sil: Probe Of course :00:06. 0 failed with error-22
This error occurs at startup.

It should be hard disk scan.

The hard disk model and power supply are possible.