# CreateSegment ## Description This command allows you to create a new segment. If you select a range using the anchor, IDA will propose the start address and the end address of the selection as defaults for the segment bounds. You need to specify at least: * the segment start address * the segment end address (excluded from the range) * the segment base Click [here](https://github.com/HexRaysSA/ida-docs/blob/9.3/user-guide/general-concepts/segment-address-space.md) to learn about addressing model used in IDA. If "sparse storage" is set, IDA will use special sparse storage method for the segment. This method is recommended for huge segments. Later, it is possible to change the storage method of any region using [set\_storage\_type](https://idc.docs.hex-rays.com/set_storage_type.html) IDC function. If another segment already exists at the specified address, the existing segment is truncated and the new segment lasts from the specified start address to the next segment (or specified end address, whichever is lower). If the old and the new segments have the same base address, instructions/data will not be discarded by IDA. Otherwise, IDA will discard all instructions/data of the new segment. An additional segment may be created by IDA to cover the range after the end of the new segment. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.hex-rays.com/ida-actions/createsegment.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.