SUSE Support

Here When You Need Us

Adding large disks to the system leads to messages "Very big device. Trying to use READ CAPACITY(16)."

This document (7023343) is provided subject to the disclaimer at the end of this document.


SUSE Linux Enterprise Server 11
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server 15


After a large disk has been added to the system the kernel logs a message like:
kernel: [93442.940949] sd 0:0:2:0: [sdc] Very big device. Trying to use READ CAPACITY(16).
p, li { white-space: pre-wrap; }


While probing the new disk the size of it is calculated.If the size exceeds or is equal to 4294967296 sectors the message will be logged.

If the size of the disk is reduced by 1 sector so the entire disk size is max. 4294967295 sectors large the notice can be avoided.

This message is nothing to worry about unless additional messages indicating that the "Read Capacity (16)" has failed are logged.


Some internal kernel variables of the SCSI driver can hold maximum values of 4294967295 (0xffffffff). If a disk, larger than this amount of sectors is added to the system a function (read_capacity_16) needs to be called to deal with the larger amount of sectors. To do so special SCSI commands need to be sent to the disk.

Additional Information


This Support Knowledgebase provides a valuable tool for SUSE customers and parties interested in our products and solutions to acquire information, ideas and learn from one another. Materials are provided for informational, personal or non-commercial use within your organization and are presented "AS IS" WITHOUT WARRANTY OF ANY KIND.

  • Document ID:7023343
  • Creation Date: 11-Sep-2018
  • Modified Date:03-Mar-2020
    • SUSE Linux Enterprise Server

< Back to Support Search

For questions or concerns with the SUSE Knowledgebase please contact: tidfeedback[at]

SUSE Support Forums

Get your questions answered by experienced Sys Ops or interact with other SUSE community experts.

Support Resources

Learn how to get the most from the technical support you receive with your SUSE Subscription, Premium Support, Academic Program, or Partner Program.

Open an Incident

Open an incident with SUSE Technical Support, manage your subscriptions, download patches, or manage user access.