Dell Vostro 460 (Late 2010) - Manual (Page 100)

Controller test in the Dell
Diagnostics.
X:\ IS NOT
ACCESSIBLE. THE
DEVICE IS NOT READY
Insert a disk into the
drive and try again.
WARNING: BATTERY IS
CRITICALLY LOW
The battery is running
out of charge. Replace
the battery, or connect
the computer to an
electrical outlet;
otherwise, activate
hibernate mode or shut
down the computer.