diff --git a/changelogs/fragments/6770-proxmox_disk_create_cdrom.yml b/changelogs/fragments/6770-proxmox_disk_create_cdrom.yml
new file mode 100644
index 0000000000..062ff4c6d7
--- /dev/null
+++ b/changelogs/fragments/6770-proxmox_disk_create_cdrom.yml
@@ -0,0 +1,2 @@
+bugfixes:
+  - proxmox_disk - fix unable to create ``cdrom`` media due to ``size`` always being appended (https://github.com/ansible-collections/community.general/pull/6770).
diff --git a/plugins/modules/proxmox_disk.py b/plugins/modules/proxmox_disk.py
index 8b158e7062..e80b4f7da9 100644
--- a/plugins/modules/proxmox_disk.py
+++ b/plugins/modules/proxmox_disk.py
@@ -505,7 +505,9 @@ class ProxmoxDiskAnsible(ProxmoxAnsible):
                 timeout_str = "Reached timeout while importing VM disk. Last line in task before timeout: %s"
                 ok_str = "Disk %s imported into VM %s"
             else:
-                config_str = "%s:%s" % (self.module.params["storage"], self.module.params["size"])
+                config_str = self.module.params["storage"]
+                if self.module.params.get("media") != "cdrom":
+                    config_str += ":%s" % (self.module.params["size"])
                 ok_str = "Disk %s created in VM %s"
                 timeout_str = "Reached timeout while creating VM disk. Last line in task before timeout: %s"