Format corrupted Internal storage

my mobile android version is 4.4.2 (kitkat). A few weeks ago its internal storage got corrupted saying "phone storage is damaged. try reformatting it". when i try to format, it doesn't gets format and again error pops up saying "damaged phone storage".
I performed hard reset and no success. then i flashed stock rom again and again same error after mobile boot up.
when i connect mob to pc, sometimes it shows unmounted memory. but sometimes it show the internal storage. In some cases when...

Format corrupted Internal storage

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