The answer to this depends on the issue with your hard drive and what the cost of replacement would be. If your hard drive is simply not working, meaning there are no noises coming from it, then it is likely that replacing the hard drive is the best course of action. However, if your hard drive is making strange noises or running very slowly, it may be a better idea to attempt to repair it instead of replacing it entirely.
The cost of replacing your hard drive will depend on several factors. The size and type of the hard drive, as well as the retail prices for new drives, need to be taken into account before making a decision. Also, it is important to consider whether or not the cost of buying a new hard drive is worth it in comparison to the cost of repairing the old one. A professional repair may be expensive, but depending on the cost of a new drive, it could end up being more cost-effective in the long run.
It should also be noted that if your hard drive is not working properly, then it is possible that some of the data stored on it could be lost. For example, if your hard drive makes a clicking noise, then it is possible that your data could be corrupted, meaning that it may not be recoverable. If this is the case, then you may need to consider purchasing a new hard drive in order to avoid any potential data loss.
Overall, the decision of whether to replace or repair your hard drive ultimately comes down to its condition and the cost of the repair or replacement. If your hard drive is making strange noises or running very slowly, then it may be worth attempting to repair it. However, if it is not functioning at all, then replacing it might be the best option. Whatever you decide to do, it is important to take the cost into account and consider if it is worth the expense.