# New My Book 4TB not not seen on network

**URL:** <https://forums.sandisk.com/t/new-my-book-4tb-not-not-seen-on-network/388403>\
**Category:** External SSD for macOS\
**Created:** [June 22, 2018, 10:37pm UTC](https://forums.sandisk.com/t/new-my-book-4tb-not-not-seen-on-network/388403 "2018-06-22T22:37:10Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![KeyWestKev](https://sea2.discourse-cdn.com/sandisk/user_avatar/forums.sandisk.com/keywestkev/32/59689_2.png) [@KeyWestKev](https://forums.sandisk.com/u/KeyWestKev)\
**Post date:** [June 22, 2018, 10:37pm UTC](https://forums.sandisk.com/t/new-my-book-4tb-not-not-seen-on-network/388403/1 "2018-06-22T22:37:10Z")

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I just purchased the My Book 4TB to be my backup for Time Machine. When I selected My Book disc as my back up, I received a message to erase the disc before I proceeded. After I erased it, I can no longer see the disc on the network.

What the heck, how do I set this up.

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**Author:** ![Brandon.P](https://avatars.discourse-cdn.com/v4/letter/b/50afbb/32.png) [@Brandon.P](https://forums.sandisk.com/u/Brandon.P)\
**Post date:** [June 26, 2018, 6:12pm UTC](https://forums.sandisk.com/t/new-my-book-4tb-not-not-seen-on-network/388403/2 "2018-06-26T18:12:55Z")

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Hi KeyWestKev,

After erasing the drive, you need to check the file format of drive. My Book must be formatted as HFS+ in order to be used with Time Machine.