unable to write files to external usb drives

Click on the drive, choose Get Info from the File menu, and check the format.

If it's formatted as NTFS, reformat it as MS-DOS, exFAT, or Mac OS Extended (Journaled) as desired, or install software such as Paragon NTFS on the computer.

If it's formatted as FAT32 or exFAT, use the Disk Utility's Repair Disk command on it; this may also happen for a flash drive which is about to fail.

If it's formatted as Mac OS Extended, click Authenticate and provide your administrator password, or change the permissions on that specific folder in its Get Info window.

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EY guys since you are all pretty good about stuff. What about try create something unique from every ones opinion.

small or big time still matter aslong it's useful. idea everyone has.

EY Niel that thing is pretty amazing. How easay for you deal with computer problem. i saw talent in you bro. idea + talent = goal