The storage device details such as available space on disk, total size, etc can be viewed under Disk Stats. The stream corresponding to disk stats is “uplink_disk_stats” stream. This stream has the following fields:

FieldDescription
nameName of the disk partition
totalTotal storage capacity of the partition in bytes.
usedDisk space that is already occupied in the partition, in bytes.
availableDisk space that is available in the partition, in bytes.