OS X Mavericks doesn't read my external hard drive

Dear Apple Support Community,
Yesterday I bought a new MacBook Pro with OS X Mavericks.
I tried to connect by quite new external hard drive bought in Germany, a Spaceloop 3.0 1.5 Tb by CnMemory.
I can see the external drive on my desktop but it looks like it is empty, although there are something like 600 Gb of data in it.
I reconnected it to my old white MacBook and everything looks fine.
Do you have any suggestion?
Thank you in advance for the help,
Marco

@banakaffalata thank you for sharing your experience, I am really sorry for your data loss... :/
I have two more hard drive but I'll run a backup before connecting them to the laptop with Mavericks.
Fortunately I haven't lost anything so far, and I also managed to understand better how things work.
It basically takes around 15 mins to Mavericks to read my hard drive.
This means that anytime I try to do something before 15 mins I get errors or crashes.
After 15 mins I can read and copy everything from the external drive to laptop, but I cannot delete any file from the external drive (error code -50).
Any idea?
I will write to CnMemory to get their opinion too. This hard drive has been bought one month ago and is a USB 3.0, should be absolutely compatible and still works perfectly with Snow Leopard (never had the chance to try it with Lion, though).
Regarding deactivating the drive, this is an option on the Disk Utility area (sorry if I'm not using the correct terminology, but my laptop is set to Italian). Basically, when I first connected my hard drive to the laptop, the drive got deactivated. As I wrote you some posts ago, I reactivated the external drive from my old laptop.
I initialised the drive as Mac Os Journaled by using the faster initialisation available from my old laptop (I was running out of time and the second faster initialisation was going to take several hours, apparently). When I tried to initialise the external drive from the new laptop I got an error saying that it was not possible to deactivate the hard drive, thus it was not possible to initialise it.
Thanks again for the help, Mark, much appreciated.

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