Problem with failing ata link

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https://bbs.archlinux.org – Hello,I might be in the wrong section, but I got a serious issue I can´t track down!Lets start with the symptoms:on BIOS-HW-initialisation I get randomly a S.M.A.R.T. error for my root-HD (if the error occurs ARCH won´t boot, but WIN7 does from the same drive without any problems!)if ARCH start usually everything is fine, but:recently, during normal usage of ARCH, my second HD with my home-partition disappeared (still listed on /etc/mtab, but no more in fdisk -l or lsblk)I know, that I can´t exclude possible hardware-problems, but since my second HD never showed any problems via S.M.A.R.T. (HowTos)