Resizing the C drive in Windows Server 2019 can sometimes be tricky, especially when the built-in Disk Management tool doesn't allow extension due to unallocated space not being adjacent or other system restrictions. Fortunately, there are safe ways to accomplish this by reallocating free space from other partitions such as the D drive. A practical method involves using software that offers the "Allocate Free Space" feature. As described in the OCR content, this approach allows you to right-click the D drive in the main interface and choose to allocate free space to the C drive. After selecting the desired amount to transfer, you confirm and apply the changes. This non-destructive process ensures that data remains intact during resizing. It's important to first back up critical data before performing partition adjustments, as unexpected power outages or software errors during the process could cause system issues. Also, ensure that the server is not performing any critical tasks while resizing to avoid corruption. Additional tools such as DiskPart command-line utility or third-party partition managers can provide more flexibility if standard Disk Management restrictions prevent changes. DiskPart can be used to delete and create partitions, but it requires caution as improper commands may lead to data loss. For ongoing server maintenance, regularly monitoring disk utilization helps anticipate when resizing might be required to maintain performance and storage efficiency. Combining these resizing techniques with best practices for server storage management keeps your Windows Server 2019 system running smoothly.