# My passport Ultra read only on mac (can't write or delete)

**URL:** <https://forums.sandisk.com/t/my-passport-ultra-read-only-on-mac-cant-write-or-delete/365074>\
**Category:** External SSD for macOS\
**Created:** [October 26, 2015, 1:03am UTC](https://forums.sandisk.com/t/my-passport-ultra-read-only-on-mac-cant-write-or-delete/365074 "2015-10-26T01:03:42Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![solvain](https://avatars.discourse-cdn.com/v4/letter/s/6bbea6/32.png) [@solvain](https://forums.sandisk.com/u/solvain)\
**Post date:** [October 26, 2015, 1:03am UTC](https://forums.sandisk.com/t/my-passport-ultra-read-only-on-mac-cant-write-or-delete/365074/1 "2015-10-26T01:03:42Z")

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I have a My Passport Ultra portable external disk which I use with both PC and Mac. I have a mac with which this disk is working just fine both for reading and writing, and it also works with the PC. Now I am trying to use a third computer, also a mac, which has Yosemite installed. I can’t write anything nor delete anything in the drive. I can only read. Please help!!!

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**Author:** ![lluna](https://sea2.discourse-cdn.com/sandisk/user_avatar/forums.sandisk.com/lluna/32/29733_2.png) [@lluna](https://forums.sandisk.com/u/lluna)\
**Post date:** [October 27, 2015, 6:49pm UTC](https://forums.sandisk.com/t/my-passport-ultra-read-only-on-mac-cant-write-or-delete/365074/2 "2015-10-27T18:49:57Z")

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Hello, what format do you have on the external drive? Have you tried performing a disk check on first aid?