Final answer:
You can use the /tmp directory for scratch space on disk in AWS Lambda, but it's important to remember that the storage is ephemeral and specific to each function invocation.
Step-by-step explanation:
If you need scratch space on disk for your AWS Lambda function, you can use the /tmp directory to temporarily store files. This directory provides 512 MB of storage capacity.
When your Lambda function is invoked, it can read from and write to files within the /tmp directory. However, keep in mind that the storage in /tmp is ephemeral and specific to each function invocation. The files stored in /tmp are not accessible across different invocations or concurrent function executions. Therefore, it is important to handle your file storage needs accordingly.