It appears that a drive can get corrupted and the only recourse is to wipe it clean then partition and format it again. Some folk forget to backup and this is their lesson.
HOWEVER with 6 hard drives you may be seeing some custom monster machine that the owner has not learned why simple machines are a good idea. That is, try the usual replacement of the power and data cables and hope it comes back but don't count on it.
I've found that some of these owners are torrent users and if so, try to distance yourself from that machine as the pests can interfere with your service and could get you a bad review.
One of the hard disks suddenly failed to initialized. The first problem I found on this disk was unable to open one of the zip files then the machine crashed. After I restarted the machine the HDD drive was missing from the Computer. My computer has 6 hard drives including the missing one. One is Corsair SSD for the OS and the rest are Samsung, Hitachi and WD all of them are 1TB. When I checked on the Device Manager the Drive is there and the device status is properly working. I checked on the Disk Management and I got a message to Initialize the Disk then I followed the instruction. Again I got an error message " Virtual Disk Manager - The system cannot find the file specified." On the Disk Management windows the status of the Disk is "Unknown 931.51GB Not Initialized- Unallocated". I tried to initialize but the same error I got.
I did not name this drive but it named automatically RV 01 and the Location is 0.
I use Acronis Disk Director to fix the problem but it cannot change the status to online.
What I did last week was I installed some programs to the Drive X instead of Drive C.
Some of the advice I got in the google are to use the hdd to another computer, now I am not yet check it. Please give me some advice regarding this matter.
My computer OS is Windows 7 64bits all the drivers and software are updated.