My external hard drive has changed its Mac format to NTFS by itself. If anyone else has experienced this?

I would post screenshots, but I'm currently back up backup (lol) my hard drive to another drive so I can reformat the drive. Anyway, today I plugged my Toshiba Caniva 1 TB external to some organization. I went to delete something (Cmd + delete) and nothing happened. So, I tried to drag and drop it into the basket and received a message saying that the file cannot be removed. It's weird, I thought. So, I open disk utility and discover that my external hard drive has decided to change to NTFS on its own. I tried to eject and reconnect it - that did not work. I tried to restart - which did not work. I thought that my USB hub could be a problem - nope. The only things that have changed since I last used my outside is that I changed the battery in my MacBook, put in an SSD and upgraded to El Capitan. I don't see how one of these could cause this but I thought I would mention it. Anyone who has something similar happens? Thank you.

The reader not to not reformat in NTFS. If the disk has been reformatted would vanish all your data. I suspect that before you upgrade to El Capitan you ran a third party app that would allow you to use NTFS formatted disk. Once you upgrade to El Capitan the app is no longer compatible with your new operating system. You must download and install an upgraded version of your application that supports El Capitan. Or, you can copy all data from the disk and reformat then for your Mac.

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