Dual Boot with Snow Leopard and Mavericks not possible?

I have a Early 2011 Macbook Pro with 2,3 GHz i7 Quad and two 512 GB SSDs (the secondary disk in an optical drive bay enclosure). This Macbook Pro can run Snow Leopard and Mavericks on the primary disk without problems. When I try to set up a dual boot system however, problems appear and it looks like it is not possible. When I start from Snow Leopard, I cannot select Mavericks as a start volume and vice versa. The error message says something like "Bless tool" cannot use this disk, i.e. unmount and boot from it. The problem remains when I exchange the disks (putting the primary disk in the drive enclosure and vice versa). When I put the secondary drive in an external case however, it is possible to boot from it -  but strange things happen when the system starts: My computer clock is reset to 1/1/2001, WiFI passwords are not remembered for more than one session, disk permissions are reported as "repaired" but do apear as not repaired when I check them again - and other issues). I have verified both disks already and repaired permissions but that does not change the situation. So my experience is different from what is said in https://discussions.apple.com/thread/566781. It looks like the latest Mavericks cannot coexist with Snow Leopard on neiter a secondary internal drive nor on an external drive. This is strange since both disks and systems work flawless when run alone. Any suggestions to solve this problem?

When I check the Mavericks disk in the optical drive with disk utility after booting / running Snow Leopard on the primary disk I get som errors, see below ("disk utility Info"). So after all, I decided to erase the disk and install Mavericks new. But even erasing the disk is not possible when it is in the optical drive enclosure. I get this error message:
"Volume Erase failed with the error:
Could not unmount disk"
When I put this disk into an external case connected via USB however, it starts and runds MAvericks without any Problem. Same happens when I put thie Mavericks disk into the internal primary hard disk place.
"disk utility Info" when verinfying the secondary drive in the oprical bay:
Verifying volume “Samsung SSD Daten”
Performing live verification.
Checking Journaled HFS Plus volume.
Checking extents overflow file.
Unused node is not erased (node = 40)
Checking catalog file.
Unused node is not erased (node = 30)
Checking multi-linked files.
Checking catalog hierarchy.
Checking extended attributes file.
Unused node is not erased (node = 8)
Checking volume bitmap.
Volume bitmap needs minor repair for orphaned blocks
Checking volume information.
The volume Samsung SSD Daten was found corrupt and needs to be repaired.
Error: This disk needs to be repaired. Click Repair Disk.
Verify and Repair volume “Samsung SSD Daten”
Error: Could not unmount disk

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