Is my disk about to fail?

Yesterday I experienced that my NAS would not respond to input. I tried to hold the power button to shut it down but i did not react. I had do disconnect the NAS from the power and then reconnect and power it on. Well it worked and my NAS booted and worked again.

But today it was again not responding to input and I did the the same thing as above but the first time it did not helped, but after a few more tries I got it to respond. When I then was checking the log I noticed that Disk 1 reported ATA error and now I want to know if my disk is really failing or is there another problem.

Let me know if u want me to send in logs.

SMART-information för Disk 1
Modell: ST31000520AS
Serie: 9VX0G89Z
Fast programvara: CC32

SMART-attribut
Tid för uppstart 0
Antal start/stopp 36
Räknare för omallokerad sektor 1909
Antal timmar med ström på 12900
Antal omförsök till uppstart 0
Antal ström på/av 18
Temperatur i Celsius 36
Aktuellt antal väntande sektorer 776
Offline ej korrigerbara 776
Antal CRC-fel under UDMA 0
Head Flying Hours 64557653439121
Antal ATA-fel 540

Utökat attribut
Tillägg under drift 0
Borttagningar under drift 0
Lp stat-händelser 4
Strömfel 0
Hårddisksåterställningar 0
Omförsök 0

//Erik