# WD MyPassport 4to : Too Slow!

**URL:** <https://forums.sandisk.com/t/wd-mypassport-4to-too-slow/409232>\
**Category:** External SSD for macOS\
**Created:** [October 21, 2018, 10:13pm UTC](https://forums.sandisk.com/t/wd-mypassport-4to-too-slow/409232 "2018-10-21T22:13:45Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![tabasko](https://avatars.discourse-cdn.com/v4/letter/t/f08c70/32.png) [@tabasko](https://forums.sandisk.com/u/tabasko)\
**Post date:** [October 21, 2018, 10:13pm UTC](https://forums.sandisk.com/t/wd-mypassport-4to-too-slow/409232/1 "2018-10-21T22:13:45Z")

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Hi,

I have 2 WD MyPassPort. One 3to, the other 4to.  
The 3to works fine, I mean as expected.  
The 4to works but is very slow (under 30Mb/s).

My Passport are connected directly to my iMac.  
I have also tried to switch both cables with no success

4to ref is  
WDBYFT0040BRD-0A 0318B R/N:D8B EABEGA  
Firmware : 4.004

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**Author:** ![asp73](https://avatars.discourse-cdn.com/v4/letter/a/958977/32.png) [@asp73](https://forums.sandisk.com/u/asp73)\
**Post date:** [October 25, 2018, 11:19pm UTC](https://forums.sandisk.com/t/wd-mypassport-4to-too-slow/409232/2 "2018-10-25T23:19:50Z")

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Hi tabasko,

You should check the performance of 4TB My Passport after formatting the drive. If already checked and issue persists again, recommend to use WD Drive Utility to check the health of drive.