How to Solve Hard Disk Error 303 and 305

Jean updated on Jan 11, 2024 | Home >Computer Instruction

What does hard disk error 303 and 305 Mean

Hard drive disk error 303 and 305 are diagnostic error codes. Hard disk 1 quick 303, sometimes hard disk 1 full 305 are the specific error messages that indicate the hard drive failed, dead, and needs to be replacing immediately.

So, if you're seeing such errors on your PC with the exact information in the following displayed on the machine's screen, go to back up the failing hard drive immediately and opt for the best solution to upgrade the hard disk with a new HDD or SSD.

"Start up test failed
Hard disk smart 301
Hard disk 1 Quick 303"

How to back up data on hard disk with 303 or 305 error

Again, when a hard drive is given 303 or 305 error, its life is coming to an end, only a brand new hard drive will solve the problem. The question is, most of the time you need to use a recovery disc to boot into the computer in order to use the backup and recovery software to create a backup image of files, photos, videos, and more data on the hard drive because when a hard drive failed with 303 or 305 error had the system on it, it can hardly boot.

What if you don't have a recovery CD at hand? How can you troubleshoot the issue in an emergency? Don't be afraid, here, the EaseUS Todo Backup utility can reduce your worry. Simply take out the failed hard drive and connect it to another normal computer, download EaseUS data backup software, and create a bootable rescue media.

To make a bootable disk of EaseUS Todo Backup, follow the instruction carefully.

Step 1. Prepare a USB drive which can be written and read.

Create emergency disk

Step 2. Launch and install EaseUS Todo Backup on the Computer B.

Step 3. Find and click "Tools" and choose "Create Emergency Disk".

Create Emergency Disk

Step 4. Choose the Boot disk location. You can create an ISO file, a bootable USB or CD/DVD disc.

Create emergency disk step2

Step 5. Then click "Create" to start.

After successfully booting into Windows, now you can continue with the hard drive and partition backup with EaseUS Todo Backup software.

Done with the necessary backup? Now you can shut down the computer and replace the failed hard drive with the prepared new one. To restore the backup you just created, launch EaseUS Todo Backup again, select the image file and click "Recovery". The hard disk data will come back.

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Updated by Daisy

Daisy is the Senior editor of the writing team for EaseUS. She has been working at EaseUS for over ten years, starting as a technical writer and moving on to being a team leader of the content group. As a professional author for over ten years, she writes a lot to help people overcome their tech troubles.

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Written by Jean

Jean is recognized as one of the most professional writers in EaseUS. She has kept improving her writing skills over the past 10 years and helped millions of her readers solve their tech problems on PC, Mac, and iOS devices.

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