Input Output errors on disk drives

I am completely new to the ins and outs of linux. I am trying to check my drives by running an exerciser software, blast, that checks the read and write capabilities. I run write verify loop on the drives with max data of 200 bytes and 2 iterations. Frustratingly I keep on running into this error for certain specific drives /dev/sdh and /dev/sdi where it shows an error:

Error code 5 detected on /dev/sdh/ EIO I/O Error

When I run fdisk -l. The drives mention above does not even show. It goes from /dev/sdg to /dev/sdj. Is there anything I can do to fix this or some other commands I can run or things I can read/learn so I can do some further investigating.