Final answer:
The ideal size for an HDFS block is typically 64 MB, which helps in reducing storage overhead and improving performance.
Step-by-step explanation:
The ideal size for an HDFS (Hadoop Distributed File System) block is typically 64 MB. Each file stored in Hadoop is broken down into multiple blocks, and these blocks are distributed across a cluster of servers for high availability and parallel processing. A larger block size, such as 64 MB, can help in reducing storage overhead and improving overall performance.