As long as delted files from drives (dunno if this rule is the same for SSD) are just marked as sectors to overwrite, does the delete operation of 40GB of data will put my SSD in worst condition?
Also I want to shrink volume to make partition for W7 bootable ISO, but i got the message about unmovable sectors and this limits me to max new partition size of 600MB ;<
Basically the same applies to an SSD, deleting a chunk of data will not degrade performance. The unmovable sectors are likely your pagefile and perhaps the system restore file.(I've encountered this before) If you set the pagefile to zero and temporarily turn off system restore(obviously there is a tiny risk), and reboot, you should be able to resize the volume. Once resized, reset the pagefile and system restore.
EaseUs ToDo backup is a free program that can also resize the partition without having to change anything. http://www.easeus.com/