Troubleshooting Tip: Upgrade scheduling not available - FortiGate devices without disk storage

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Description	This article describes how to handle an issue where, when attempting to schedule a firmware upgrade in the GUI with immediate or specified schedule, admins may encounter the following message: 'Specifying an upgrade schedule is not available because the following FortiGates do not have disk storage.'
Scope	FortiGate v7.6.
Solution	During the 'Choose Schedule' step of the firmware upgrade process in the FortiOS GUI, the option to specify a scheduled upgrade is disabled. The affected FortiGate device is listed under the warning message. 'Specifying an upgrade schedule is not available because the following FortiGates do not have disk storage.' Example: Navigate to System -> Firmware and select 'Upgrade All'. Select 'FortiGate Only.' On 'Firmware Selection,' select the 'File Upload' tab and upload the firmware file. On the next menu, the option to select a schedule is grayed out and only 'Immediate' is available, with the warning displayed below: As the error suggests, there is no disk storage on this device, and the error is expected. The presence of a storage disk can be confirmed by issuing the following command: exec disk list If a storage disk is not present, the command will have no output. If a storage disk is present an output similar to below will be printed but will vary by model. Disk SSD ref: 16 447.1GiB type: SSD [ATA INTEL SSDSC2KB48] dev: /dev/sdb partition ref: 17 440.1GiB, 439.0GiB free mounted: Y label: LOGUSEDXC9BA0811 dev: /dev/sdb1 start: 2048 In addition to the command, the FortiGate model number will normally indicate if a disk is present. If the model number ends with a zero/'0', these devices will not have a storage disk, so this feature will not be available. For example: FortiGate 400F FortiGate 90G FortiGate 1800F If the model number ends with 1 or 2, then these devices have log storage, and the feature should be available. FortiGate 401F FortiGate 91G FortiGate 1801F FortiGate-VMs: Templates often include two defined disks, one storing the OS and one as a general storage disk.  Related article: Upgrade scheduling not available - FortiGate devices without disk storage (FortiGate administration ...