The R0Q56A is an HPE (Hewlett Packard Enterprise) MSA (Modular Storage Array) hard disk drive (HDD) with a storage capacity of 1.8TB. It utilizes the SAS (Serial Attached SCSI) interface and has a small form factor (SFF) of 2.5 inches.

Here are the key specifications of the R0Q56A HPE MSA 1.8TB SAS 10K SFF M2 HDD:

1. Storage Capacity: 1.8TB - This indicates the amount of data that can be stored on the hard disk drive. 1.8TB is equivalent to approximately 1800 gigabytes (GB) of storage space.

2. Interface: SAS (Serial Attached SCSI) - SAS is a high-speed interface commonly used for connecting storage devices, such as hard disk drives and solid-state drives (SSDs), to servers and storage arrays. It offers fast data transfer rates and is suitable for enterprise-level storage solutions.

3. Rotational Speed: 10,000 RPM (Revolutions Per Minute) - This indicates the rotational speed of the HDD's platters. A higher RPM generally results in faster data access and transfer speeds, making it suitable for applications requiring high-performance storage.

4. Form Factor: SFF (Small Form Factor) - The 2.5-inch SFF form factor is compact and space-saving, making it suitable for use in servers, storage arrays, and other systems where space is limited.

Overall, the R0Q56A HPE MSA 1.8TB SAS 10K SFF M2 HDD offers high-capacity storage and reliable performance, making it suitable for use in enterprise environments that require fast and efficient storage solutions.