Seagate 4TB, 3,5" / SATA III (ST4000DM000) and SK-3500 Super-S Combo I bought a 4TB 3.5", SATA III Seagate Desktop HD and put it into a SK-3500 Super-S Combo. My iMac (late 2009) did, however, not detect the HD when I connect it. Since I cannot see it, I am unable to format it. The HD is also not shown in the Terminal after df -h. When I type diskutil list, however, I get the following from Terminal:

0:                                                   *4.1 GB     disk1


After diskutil list the HD is now shown in "Disc Utilities" but featured as "non-writeable" and I cannot create a partition or format it. Not sure why but I suspect that the problem could be the SK-3500 enclosure and I should try another enclosure.

If you have any ideas what else I could try (aside from trying another enclosure), I would appreciate any input very much.
The Datastore SK-3500 Super-S Combo enclosure only supports HDDs up to 2 TB. I will now either buy a Synology DS412+ or LMP DataTower 430.