# ndctl−write−labels(1) [NAME](#name)\ [SYNOPSIS](#synopsis)\ [DESCRIPTION](#description)\ [OPTIONS](#options)\ [SEE ALSO](#see-also) ## NAME ndctl−write−labels − write data to the label area on a dimm ## SYNOPSIS *ndctl write−labels \ \[-i \]* ## DESCRIPTION The namespace label area is a small persistent partition of capacity available on some NVDIMM devices. The label area is used to resolve aliasing between *pmem* and *blk* capacity by delineating namespace boundaries. Read data from the input filename, or stdin, and write it to the given device. Note that the device must not be active in any region, otherwise the kernel will not allow write access to the device’s label data area. ## OPTIONS One or more *nmemX* device names. The keyword *all* can be specified to operate on every dimm in the system, optionally filtered by bus id (see −−bus= option). −s, −−size= Limit the operation to the given number of bytes. A size of 0 indicates to operate over the entire label capacity. −O, −−offset= Begin the operation at the given offset into the label area. −b, −−bus= Limit operation to memory devices (dimms) that are on the given bus. Where *bus* can be a provider name or a bus id number. −v Turn on verbose debug messages in the library (if ndctl was built with logging and debug enabled). −i, −−input input file ## SEE ALSO *UEFI NVDIMM Label Protocol* --- # 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.pmem.io/ndctl-user-guide/v68/ndctl-man-pages/ndctl-write-labels.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.