Lenovo ideacentre c40-30, f0b400grrk [40/59] Troubleshooting problems with optical drives and hard disks

User Guide

Troubleshooting Problems with Optical Drives

and Hard Disks

Problem: The Optical drive is unable to read a CD/DVD.

Troubleshooting and problem resolution:

1. Check to determine if there is an optical drive icon in the resource manager

of the operating system. If not, restart your computer. If there is still no icon,

contact Lenovo Service. Otherwise, continue with the next step of this

procedure.

2. Conﬁrm that the CD/DVD has been properly placed in the drive. If not, reload

the CD or DVD. Otherwise, continue with the next step of this procedure.

3. Check the speciﬁcations that came with your computer to conﬁrm that this

optical drive is capable of reading this type of CD or DVD.

4. If the CD/DVD cannot be read, replace it with a known good CD/DVD such as

one that was shipped with the computer.

5. If the known good CD cannot be read, visually check the operating side of the

CD/DVD for defects.

Problem: The capacity of the hard disk, as indicated by the system, is less than

the nominal capacity.

Troubleshooting and problem resolution: For computers equipped with the

OneKey Recovery feature, the system recovery feature needs to occupy some

hard disk space. This may account for the apparent hard disk capacity deﬁcit.

Further Technical Explanation: The nominal capacity of the hard disk is

expressed in the decimal system as 1000 bytes. But the actual hard disk capacity

is expressed in the binary system as 1024 bytes (For example, the nominal

capacity 1G is 1000M, while the actual capacity 1G is 1024M).

The capacity of the hard disk shown in Windows can be calculated according to

the calculations in the following example:

The nominal capacity of the hard disk is 40G, while its actual capacity

should be: 40 x 1000 x 1000 x 1000/(1024 x 1024 x 1024) = 37G.

If the Service partition of 3G - 3 x 1000 x 1000 x 1000/(1024 x 1024 x

1024) = 2.79G is subtracted, the capacity of the hard disk shown in the

system can be obtained.