# How does the allocation unit size affect the performance of a WD 8TB drive?

**URL:** <https://forums.sandisk.com/t/how-does-the-allocation-unit-size-affect-the-performance-of-a-wd-8tb-drive/323019>\
**Category:** All Other External SSD\
**Created:** [November 25, 2024, 11:39am UTC](https://forums.sandisk.com/t/how-does-the-allocation-unit-size-affect-the-performance-of-a-wd-8tb-drive/323019 "2024-11-25T11:39:36Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![jacky\_sin](https://sea2.discourse-cdn.com/sandisk/user_avatar/forums.sandisk.com/jacky_sin/32/9122_2.png) [@jacky\_sin](https://forums.sandisk.com/u/jacky_sin)\
**Post date:** [November 25, 2024, 11:39am UTC](https://forums.sandisk.com/t/how-does-the-allocation-unit-size-affect-the-performance-of-a-wd-8tb-drive/323019/1 "2024-11-25T11:39:36Z")

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I’m trying to understand how allocation unit size affects the performance of my WD 8TB drive. Could formatting it with an incorrect size lead to slower speeds or inefficient space usage? I’d appreciate any tips on choosing the ideal allocation unit size for a large drive like this!

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**Author:** ![riyan\_shaik1](https://avatars.discourse-cdn.com/v4/letter/r/ed8c4c/32.png) [@riyan\_shaik1](https://forums.sandisk.com/u/riyan_shaik1)\
**Post date:** [November 27, 2024, 4:43am UTC](https://forums.sandisk.com/t/how-does-the-allocation-unit-size-affect-the-performance-of-a-wd-8tb-drive/323019/2 "2024-11-27T04:43:05Z")

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Hi @jacky_sin  
Have you checked our knowledge base articles?  
([Support for Western Digital Hard Drives | Western Digital](https://www.westerndigital.com/support))

Try this one.

- [Steps to Format a Drive for Use on Windows and macOS Using exFat](https://support-en.wd.com/app/answers/detailweb/a_id/20821)

Have you opened a Support Case?  
If not, contact Western Digital Technical Support for assistance.  
[[Contact Us | Western Digital](https://www.westerndigital.com/en-in/support/contact-us)]