Dear VNX
I went to site to try again .
I didn't found any other partition any other datastore , removed the DVD physically .
try with the CD booting ( external DVD ) no benefit .
I installed vcenter 5.5 in virtual machine in my lab , join the esxi4 the vcenter , trying to upgrade using vmware update manager begin and continues till 25% and failed by looking to the console of the physical machine found that
it stopped due to the same error .
and didn't rollback to the version 4 and i lost my work .
i tried to repair the system and successfully back without the VMs . i added them to the inventory as they are there in the datastore .
opened case with vmware and they told me the following :
There is an issue migrating the VMFS3 to VMFS5 while the upgrade, please follow this action plan :
-Create the 5.5 Cluster
-Connect the ESX 4 hosts to this cluster
-Migrate all VMs to the 5.5 Hosts
-Disconnect these 4.0 hosts from the cluster
-Fresh install the 4.0 hosts with the 5.5 version.
this made me upset . because this is not i expected from vmware and I can make that from beginning .
I still want to discuss this issue to get professional solution