HRESULT 0xC0AAB121 (IMAPI_E_IMAGE_TOO_BIG): meaning and diagnosis

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: the requested FreeMediaBlocks limit is below the image already assembled.

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IMAPI_E_IMAGE_SIZE_LIMIT	IMAPI_E_DATA_STREAM_INCONSISTENCY

IMAPI_E_IMAGE_TOO_BIG

IMAPI_E_IMAGE_TOO_BIG is tied directly to IFileSystemImage::put_FreeMediaBlocks. Microsoft documents that the property sets the maximum number of blocks available for image creation and that assigning a value smaller than the estimated size of current data fails. A value of zero represents an unlimited block count.

Compare the proposed limit with the current image estimate

Record the old and new FreeMediaBlocks values together with UsedBlocks.
Check whether content was added before the application recalculated target-media capacity.
For a real burn, use media/device-derived image defaults or SetMaxMediaBlocksFromDevice instead of a stale constant.

This is a configuration-time failure, not evidence that reading a file stream failed. The image is already estimated to require more blocks than the new ceiling allows. Either reduce the hierarchy first or set a limit consistent with the target capacity. Be careful when changing media after image construction: a smaller replacement medium can make a previously acceptable image impossible to fit.

FreeMediaBlocks · IFileSystemImage · CreateResultImage

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