A good tip here is if you are using your Amiga for web browsing, set aside a separate small partition exclusively for the Internet Web Pages Cache
Then if your Amiga crashes whilst surfing the Web, any checksum errors / validation issues will only be contained on the InternetCache: parition and wont affect important data on other partitions.
Your Amiga should also be faster at surfing webpages as this smaller hard cache partition wont suffer from fragmentation issues.
Are you confident the hard disk doesn't have any bad blocks/integrity problems and the 2.5" IDE cable is good quality.