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Why windows not showing 4GB ram?

There's a chip on your motherboard that is sometimes referred to as the "north bridge." One of the responsibilities this chip has is to translate information from your CPU to your RAM and vice-versa....
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recreate RAID array

if one of the drives fail, replace the drive and rebuild the RAID-0 on the dead machine: mdadm --stop /dev/md0 mdadm --create --verbose /dev/md0 --level=0 --raid-devices=3 /dev/sdb1 /dev/sdc1 /dev/sdd1...