I'm currently using Bitlocker encrypted external hard drive. It's single partition and the entire disk is encrypted.

I'd like to split the single partition into two partitions while enabling Bitlocker encryption. Can it be done without turning encryption off?

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    I'm Sure it is but back up all data before attempting, there is high risk involved. – Moab Oct 6 '19 at 14:45

No, a Bitlocker partition cannot be shrunk.

You can see this in Disk Management : Right-click the partition and you will see that the "Shrink Volume..." option is gray and disabled.

There is no other option than turning encryption off (waiting as required), then shrinking the partition and creating the second partition in the new unallocated space. Do NOT try to shrink the partition using any third-party product.

Be sure to backup first your entire disk from inside Windows, in addition to the backup of your data. AOMEI Backupper Freeware is a good backup utility that also has a boot CD/USB for emergencies.

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