Attach physical partitioin as vmdk disk to Virtualbox

/home/share/VM/W7I$ dd if=/dev/zero of=W7I.mbr bs=512 count=1
1+0 records in
1+0 records out
512 bytes (512 B) copied, 0.000173072 s, 3.0 MB/s
/home/share/VM/W7I$ sudo VBoxManage internalcommands createrawvmdk -filename /home/share/VM/W7I/W7I_sdb2.vmdk -rawdisk /dev/sdb -partitions 2 -mbr W7I.mbr
RAW host disk access VMDK file /home/share/VM/W7I/W7I_sdb2.vmdk created successfully.
/home/share/VM/W7I$ sudo chown user W7I_sdb2*
/home/share/VM/W7I$ sudo chgrp user W7I_sdb2*
/home/share/VM/W7I$ VBoxManage storageattach W7I --storagectl "SATA Controller" --port 1 --device 0 --type hdd --medium /home/share/VM/W7I/W7I_sdb2.vmdk
VBoxManage: error: The medium '/home/share/VM/W7I/W7I_sdb2.vmdk' can't be used as the requested device type
VBoxManage: error: Details: code NS_ERROR_FAILURE (0x80004005), component Medium, interface IMedium, callee nsISupports
Context: "OpenMedium(Bstr(pszFilenameOrUuid).raw(), enmDevType, AccessMode_ReadWrite, fForceNewUuidOnOpen, pMedium.asOutParam())" at line 210 of file VBoxManageDisk.cpp
VBoxManage: error: Invalid UUID or filename "/home/share/VM/W7I/W7I_sdb2.vmdk"
$ sudo chmod go+rw /dev/sdb
$ sudo chmod go+rw /dev/sdb2
$