With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
agentFLASHutilization
agent FLAS Hutilization
1.3.6.1.4.1.171.12.1.1.10.1.4
The percentage of used FLASH memory in total FLASH memory. The value will be between 0% (idle) and 100% (very busy).
Back to AGENT-GENERAL-MIB MIB page.
IPHost Network monitor allows you to monitor agentFLASHutilization on D-Link device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring D-Link switches right now.