QUES: Though Hitachi hard drives are reliable it is difficult to avoid data loss under some critical situations

correct the punctuation.

CORRECTED: Though Hitachi hard drives are reliable, it is difficult to avoid data loss under some critical situations.

QUES: It is also important to note that they can also be used to regulate an overactive immune system which can help you avoid suffering from unnecessary inflammations

correct the punctuation.

CORRECTED: It is also important to note that they can also be used to regulate an overactive immune system which can help you avoid suffering from unnecessary inflammations.

QUES: Acute lymphocytic lymphoblastic leukemia ALL ALL affects lymphoid cells and grows quickly

correct the punctuation.

CORRECTED:
* Acute lymphocytic (lymphoblastic) leukemia (ALL): ALL affects lymphoid cells and grows quickly.