It may be possible, that sdc-sdf are in sleepmode and therefore not accessible.
hdparm -C /dev/sdc
hdparm -I /dev/sdc
It is a screen copy of the disk utility on my computer.
The screenshot is unreadable, use commands and text.
If hdparm is not installed, do so via
sudo yum install hdparm
$ sudo hdparm -C /dev/sdc
drive state is: unknown
$ sudo hdparm -I /dev/sdc
HDIO_DRIVE_CMD(identify) failed: Invalid exchange
$ sudo yum install hdparm
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rhel-6-workstation-rhev-agent-rpms | 2.8 kB 00:00
rhel-6-workstation-rpms | 3.7 kB 00:00
rhel-6-workstation-rpms/primary_db | 20 MB 00:02
Setting up Install Process
Package hdparm-9.16-3.4.el6.x86_64 already installed and latest version
Nothing to do
My guess is still with sleep mode or bad cabling or insufficient power.
Maybe there is a tool on the WD site to control sleep mode for your discs.
It may be something proprietary.
Since all discs work well if I connect this enclosure to my windows 7 computer, should it be different on windows 7 and Linux?
Did you actually write to and read back from the discs under windows?
If this works, then this excludes cabling and power problems of the enclosure.
The sleep mode may be addressed by the proprietary nature of windows drivers.
The linux and windows boxes are two different machines?
Then maybe there is an issue with the usb3 port on the linux machine.
I just tried the enclosurer on windows 7. It do works well.
The actions (all successed) include
1) covert the discs format to GBT
2) create simple volumn and format
3) put some files into two of the five discs and then copied them out.
the screen copy of my operations is
htt p_ dl.dropbox.com/u/965530/PrintScreen.png
The model number of the hdds is WD30EFRX. I also checked the office website of WD and I have not found any sleep model related software for this product.
I have had formated the detectable disc on Linux previously, it also can be succussfully mounted and operated.
Yes. They are two indpendent computers. But I tried the USB 3.0 port on the Linux computer with a flash disc, it works well.
Originally Posted by Irithori