From sleep mode, Samsung’s Fast Start technology powers on the device in just three seconds. The 128/256GB solid state drive (SSD) provides adds space in helps in faster booting than a hard disk drive (HDD) notebook. In this advanced sleep mode, data is also saved on the SSD as well as the internal memory. This means that content is ready even if power is suddenly lost or the battery accidentally removed.
This is Samsung Fast Start instant-on feature.