# Is a sample sheet required to run DRAGEN Array?

A sample sheet is not required to run DRAGEN Array but can be used to enable analysis of samples from different directories or allow user to choose specific samples rather than entire BeadChips.

**For DRAGEN Array cloud:**

Only IDAT files are used as input. Sample sheet contains BeadChip barcode and sample position.

The sample sheet template is available within BaseSpace or the [DRAGEN Array Downloads](https://support.illumina.com/array/array_software/dragen-array-secondary-analysis/downloads.html) page.

**For DRAGEN Array local:**

IDAT files can be used as input for 'genotype call' command.

IDAT sample sheet can be a CSV or JSON formatted file with direct paths to sample IDAT files to enable analysis of samples from different directories.

GTC files can be used as input for 'genotype gtc-to-vcf' command.

GTC sample sheet can be a CSV or JSON formatted file with direct paths to sample GTC files to enable analysis of samples from different directories.

The sample sheet template is available on the [DRAGEN Array Downloads](https://support.illumina.com/array/array_software/dragen-array-secondary-analysis/downloads.html) page.

For additional information, see:

* [DRAGEN Array Sample Sheet templates](https://support.illumina.com/downloads/dragen-array-sample-sheet-templates.html)
* [DRAGEN Array User Guide](https://help.dragenarray.illumina.com/) under section [Input Files](https://help.dragenarray.illumina.com/product-guides/input-files)
* Illumina Knowledge article [How to format file path for DRAGEN Array IDAT sample sheet and GTC sample sheet for Windows OS](https://knowledge.illumina.com/microarray/general/microarray-general-faq-list/000008510)

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