is it possible to connect second hdd to esxi 5.5 and add this hdd to new linux vm ?
You dont have to connect to ESXi 5.5 necessarily. You can connect to your desktop and open vsphere client and on the Host->VM-> Add a USB Controller. Then you select the USB icon and select the USB Attached to your desktop.
Just make sure that your VM is HW version 9 and above..