Esse som é do seu disco rígido portátil. Está fazendo hora extra para entregar os dados.
Eu recomendo que você faça uma varredura para setores defeituosos também -
Vá para o menu Iniciar, digite "cmd" sem as aspas.
Clique com o botão direito e clique em "Executar como administrador"
digite "chkdsk" sem as aspas. Ele mostrará todos os setores defeituosos no seu disco rígido.
Ou faça uma varredura seguindo estes procedimentos -
Right click the Start Windows icon.
In the shortcut menu, click Open Windows Explorer.
In the navigation pane, click Computer so that your drives appear in the right pane.
Right-click the drive that you want to check.
Click Properties.
Click the Tools tab.
Click the Check now button.
In the Check Disk window, select the Automatically fix file system errors check box.
Note If you want to perform a detailed test of the hard drive, you can select the Scan for and attempt recovery of bad sectors check box. You should do that in the justified suspicion of existing hardware error in any case. But please note that the operation can then take a long time. For a first routine check, we recommend that you do not select this option.
Click Start.
If the drive that you want to check is currently in use and it is your system drive, you will see a dialog box with a warning message. In this case, click Schedule disk check.
Exit all open programs, and then restart your computer. The checking will start automatically before next Windows startup and display the results when completed.
If you are not checking the system drive, you do not have to turn off the computer. However, the selected drive may also be in use. In this case, you receive a message. After you have saved all files and close all open programs, click Force a dismount.