Hi,
I have a very amateur question. I have a laptop with two hard drives. One hard drive seems to be broken. Could I transfer everything from that hard drive to the other one and use just the healthy one?
Thanks.
Are you sure your laptop has 2 hdds or is it a single hdd that is partitioned into 2?  Very few laptops have 2 physical drives but some do so just want to make sure.

What exactly do you mean when you say that one drive appears to be broken?  Are you able to access it at all?  If it's not accessible then it may not be possible to GET the data from it.  Depending on why it's not accessible, it may be possible to attach the drive to another computer and copy the data from it. Hi,

I suppose they are just partitioned into 2 (is there a way to check that?). My laptop has been running very slow lately and I was advised to RUN DIFFERENT checks and based on crystaldisk info I was advised to replace the disk. I was just wondering if I move all the files from one drive to another (in My Computer there is a drive C and a drive A; so to move everything from C to A) would solve the problem. The drive C is accessible; it is just slow and I got 'crystaldiskinfo caution; reallocated sectors count' message after running that crystaldisk on it.
Thanks. What make and model is the laptop?

You could look at Disk Management to see whether you have 2 disks or only 1.  What OS are you running?If he ran CrystalDisk the info is there as well...OP - Can you post a screenshot from either Disk Management or CrystalDisk?