about RB Metal 2SHPn bad blocks

Hardware MikroTik hardware general
1

i buy RB Metal 2SHPn at yestday.
but look this bad blocks.
this is new?why new have bad blocks？can i goto warranty？

2

I cant tell about warranty, but what to a /system check-disk tell you?

3

i run /system check-disk and reboot.
0.7% bad blocks,no change.