external drive shows up in device manager but not in my computer

[Tyrone_6]

my Seagate 3 t harddrive is shown when I go to device manager but its shown asdestop scsi disk it didn't do that before also now my cdrom has not been showing in device manager

 

[Boogieman_WD]

Hey there, Tyrone_6.

Would you please open Disk Management and check if the drive is recognized there and also what it says about it and the CD-ROM? Please post a screenshot (you can use imgur.com to upload the image). Basically it might be a matter of just assigning the drive a new letter, here's how to do it: How to change the drive letter assignment in Windows.
You could also try the drive with a different computer and a different cable to see if the same thing happens again.

Please let me know how it goes.
Boogieman_WD