How to use second disk on VM created with azurerm kubernetes cluster node pool

Created jenkins worker nodepool using azurerm_kubernetes_cluster_node_pool setting the worker node pool disc type to Ephemeral. By default two disks are getting created 1./dev/sda1 2./dev/sdb2. But not able to make sure that the second disk /dev/sdb2 gets used once the first disk /dev/sda1 is fully used. What option or change is required to overcome this issue?

terraform {
required_providers {
azurerm = {
source = “hashicorp/azurerm”
version = “~>3.2.0”
kubernetes = {
source = “hashicorp/kubernetes”
version = “~>2.10.0”

I am still stuck on this issue. Any input would be really helpful! Thanks.