To format a computer means that all your data will be lost. Your operating system, programs, emails, drivers, pictures, everything! All of the updates on your programs will be gone, infarct the every entire program will be gone.
This drop in TSH is an attempt to return circulating thyroid hormone levels to normal. So, a test to measure the amount of TSH in your system will usually show lower than normal TSH when the thyroid is overactive. So, in general, LOWER TSH = OVERACTIVE THYROID / HYPERTHYROIDISM.
Low TSH and high FT4 levels are usually seen in people with a condition called hyperthyroidism, the end result of an overactive thyroid gland. Low TSH levels can also indicate that the pituitary gland itself is damaged; however, this is very rare.