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Windows & Workstations

MDT: copying a task sequence overwrites the original

You copy and paste a task sequence in MDT Deployment Workbench to make a variant, but editing the copy changes the original too.

What you’re seeing

  • Changes made to a pasted task sequence also show up in the original one.
  • Both task sequences in Deployment Workbench share the same ID or refer to the same folder in the deployment share.
  • Builds that use the original sequence suddenly behave like the modified variant.
  • Deleting the copy removes or breaks the original as well.

Common causes

Every environment is different, but these are the causes our engineers find most often:

  • Copy and paste in Deployment Workbench creates a linked reference to the same underlying task sequence, not an independent duplicate.
  • MDT stores each task sequence's steps in an XML file tied to its ID, so two entries with the same ID share one file.
  • Workbench treats pasted items much like shortcuts within its folder structure, which is easy to mistake for a true copy.

Why it matters

A task sequence defines exactly how new and rebuilt PCs are set up, including which applications, drivers and security settings they get. If the production sequence is silently changed, every machine imaged afterwards can come out wrong, missing software or carrying test settings, and the problem may not surface until users start reporting issues. Tracking down and rebuilding affected machines costs far more time than the original change, and imaging may need to pause until the sequences are separated.

How AskTechGurus fixes it

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Frequently asked questions

Have the machines we imaged recently been set up incorrectly?

If they were built after the change, they may carry the variant's settings. An engineer can compare the sequences and help you identify which builds are affected.

Can the original task sequence be recovered?

Often, yes, from a backup of the deployment share or by reconstructing it from what changed. We confirm the differences before restoring anything.

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