We would like to define this partition for the purposes of creating a new
file system. Also, notice that approximately 4 GB of storage is available for this new partition. This is be determined by examining the total amount of space reported with the backup partition (2) and comparing this information with the existing partition’s total disk space sizes.
I’m not sure how to understand that. What’s specifically strange to me is how be is used there. Looks suspiciously like a subjunctive, but I’m not entirely sure, to tell you the truth. Would you agree that this is determined without be would sound equally fine?
“This is be determined” is wrong! The infinitive “be” is NEVER used with “is”.
This is determined
This can be determined
Other modal verbs (‘must’, ‘may’, ‘shall’, along with the other forms ‘might’, ‘could’, ‘should’) are grammatical here in place of the ‘is’, but don’t make much sense in the context.
By the way, this answer refers to ‘standard English’. There may well be variants of English where “is be” is acceptable, but I don’t know of any.