Are new HP Gen8 servers compatible with g7 drives?

Are HP Gen8 servers (namely DL380 Gen8 with 2.5" HP disks) compatible with 2.5" harddrives from G5-G7 servers? I mean original HP disks in HP caddies not plain SAS/SATA drives.

No, they're not compatible sorry - they're in different caddies - obviously the disks themselves are regular SAS or SATA but they come in different packaging and one won't physically slot into the other.

By the way, there's no such things as a DL380 Gen8, it's either a DL380e or DL380p - but it doesn't matter for this question.

To add to the above comments, we purchased just short of 30 new HP Gen8 Servers for a cluster we are running and I can confirm that hard drives themselves are the same/standard 2.5" disks but the caddies ARE different.

They are a new smart caddy with a chip inside - HP aren't selling these individually without drives, but they have just been released through wholesale channels including http://www.ebuyer.co.uk and http://www.servercaddies.co.uk - neither had enough stock when I needed them though.