Q: 起動ディスクが350MBしか余裕が無く、どれが不要でどれが必要かわからず、更に削除の方法もわからない、全くお手上げ状態です。　どなたか解決方法を教えてください。　

My imac's start up disk is almost full remain only 250MB.

And I do not know how to delet file or data but do not know which is required which is able to dispose.

If someone knows to solve this problem please let me know.

Thanks in advance,

M. Ogura