Ascp ((better)) Download: Sra

It can be up to 10–100 times faster than standard downloads, particularly for multi-terabyte datasets.

Ensure the ascp binary is in your system path, typically located at ~/.aspera/connect/bin/ascp .

To use ascp , you must first install the Aspera Connect client. ascp download sra

# Example for Linux sh ascp-install-3.5.4.102989-linux-64.sh Use code with caution.

Use the following command structure to download a specific SRA file: It can be up to 10–100 times faster

ascp requires a private SSH key for authentication with NCBI servers, usually found at ~/.aspera/connect/etc/asperaweb_id_dsa.openssh . How to Download SRA Data Using ascp

Unlike prefetch , which sometimes switches to slower HTTPS, ascp forces a dedicated high-speed lane. Prerequisites and Installation # Example for Linux sh ascp-install-3

SRA data is organized by accession number. For a specific SRR ID (e.g., SRR442587 ), the path on NCBI's server follows a hierarchical structure. You can often find these paths using the SRA Run Selector or by querying the European Nucleotide Archive (ENA) , which also supports Aspera.