Good morning/afternoon/night :
The unit was presenting failure to maintain a network connection . I open the unit to connect hard disk to a PC and to backup the information .
When connecting to the PC hard disk drive manager asked me to indicate the type of partition and I chose MBR.
After document myself understood that the type of partition is HFS and I use certain programs to access information from windows .
Is there any way to convert back to HFS partition from MBR without losing data ?
No idea as well, but there was no need to do that, as all your need is an app/tools which will allow you to see Linux partitions.
Worst case scenario look here: