FreeBSD newcomer help solve problems fast knot stickers ah

Today, just put on FreeBSD , but I do not know why, whenever the system is started is completed, the hard disk light has been lit, can not hear the voice to read the disk , the system uses the normal, nor cards, idle CPU occupancy rate of 0.4% , using systat-iostat view , see the main hard drive IO number only around 0% . . Also , there is no Windows Or Linux into this problem , in short, everything is normal, but just do not know why the hard drive light stays on .... seek help, thank you
- ---- Solution -------------------------------------------- < br> seems to be an old problem , you look at your settings in the BIOS

SATA controller is set to AHCI look , it seems to be a
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pro , too grateful to you ~ ~ I Google for a long time did not find the answer ~ ~ ~ this time somehow speed is also much faster ~ ~