DAS in SATA is pushed back over the power cable (pin 11) not the data connector like in ATA/IDE drives it's pretty much meaningless and up the the drive manufacturer to say if it's even supported, which is why for dekstop drives that are fed directly from the power supply the LED activity monitoring doesn't work at all and depending on your BIOS will either be off or just randomly signaling at best based on some data from your PCH.

Samsung for example only supports it on the DC (datacenter) series of their drives which is for enterprise storage the DAS in this case is only enabled in certain modes to note if the drive is active or spare/standby or to identify a specific drive there is no actual write/read iop activity feed back in SATA drives.

Also dear lord was that document auto-translated? I've expected this level of English from a 3rd tier Chinese OEM not Samsung...

>4. Samsung SSDs for data centers are

Basically, Samsung SSD 845DC PRO and 845DC EVO support the SATA 3.1 specifications. However, Samsung has adjusted only the DAS feature as “enabled” by default to make the LED blink regardless of the SATA specifications in the host systems.