Two Western Digital HDD 3TB WD Red NAS RAID 3.5-inch internal HDDs, model WD30EFRX, are for sale. I purchased these as a set on Amazon and used them for storing NAS image data, but I'm selling them because I upgraded my storage capacity. I didn't experience any problems while using them. The data is formatted in the default NTFS format. I don't smoke. Feel free to purchase if interested.