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AWS datasync: Clarified PREPARING phase behavior

Service: datasync · 2026-07-29 · Documentation low

File: datasync/latest/userguide/how-datasync-transfer-works.md

Summary

Added details about source location scanning during PREPARING phase for 'transfer all data' tasks.

Security assessment

Operational clarification with no direct security impact.

Evidence

During this time, DataSync scans your source location to determine what it's transferring and how to transfer it.

Diff

diff --git a/datasync/latest/userguide/how-datasync-transfer-works.md b/datasync/latest/userguide/how-datasync-transfer-works.md
index 83fafc1ca..42b942d78 100644
--- a//datasync/latest/userguide/how-datasync-transfer-works.md
+++ b//datasync/latest/userguide/how-datasync-transfer-works.md
@@ -147 +147 @@ DataSync by default prepares your transfer by examining your source and destinat
-If you configure your task to [transfer all data](./configure-metadata.html#task-option-transfer-mode), there's no preparation. When you start your task, DataSync immediately transfers everything from your source to your destination without comparing locations.
+If you configure your task to [transfer all data](./configure-metadata.html#task-option-transfer-mode), DataSync doesn't compare your source and destination locations. Your task execution still has a `PREPARING` status, though. During this time, DataSync scans your source location to determine what it's transferring and how to transfer it.