How to Solve Hard Disk Error 303 and 305

Jean updated on Apr 08, 2019 to Backup and Recovery | How-to Articles

What does hard disk error 303 and 305

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 hard disk with 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, 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 an empty USB or CD/DVD drive
Note: Do remember to empty or clear your USB or CD drive. If you saved data on it, move them to another safe location.

Step 2. Connect USB/CD/DVD to your Windows PC
Step 3. Run EaseUS Todo Backup and click Create Emergency Disk in Tools on the left pane.

Select to create emergency disk.

Step 4. Choose USB or CD/DVD as the disk location for creating to WinPE disk so as to boot up the computer when the Operating System fails to boot or computer dies.
Step 5. Click Proceed to start creating the WinPE disk to your USB or CD now.

Create WinPE disk to USB/CD.

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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Frequently Asked Questions

Why choose EaseUS Todo Backup?

"The easiest way to protect your data and system files."techradar

"EaseUS Todo Backup Free is one of the most popular free data backup applications available. This software offers a myriad of features and is extremely user-friendly. It provides a full system backup, meaning you can back up your entire operating system."TopTenReviews

"EaseUS ToDo Backup Home is a great backup program, well suited to the home and SMB space."PCWorld

What is the difference between Clone and Backup? In what cases should I use Clone?

Clone will copy one disk to another or one partition to another (unallocated space is also supported). Usually, this option is used to upgrade the current disk by creating an identical copy. Backup will generate a .PBD image file containing the selected files or system that can be restored from the .PBD image if needed.

What is the difference between System Backup and Disk Backup?

System Backup will auto-select the system boot related partition(s) as the backup source to make sure the system image can be restored properly. Disk/Partition Backup will allow you to manually select a whole disk or speficy a certain partition as the backup source. You will get the same backup result as System Backup if you manually select the system and boot partitions with the Disk/Partition Backup option.

As a computer newbie, what features should I use to protect my computer?

You can use System Backup to back up the system and boot partitions, use Disk/Partition backup to back up the data partition and add plans to run an automatic backup. If you use the computer frequently or have software that may cause boot failure of the computer, we would suggest you back up the computer every 1 to 2 days. For other situations, you can backup the computer once a week. In addition, you can schedule File Backup to back up the files which are changed frequently.

What kind of storage service should I use to save my backup images?

EaseUS Todo Backup can save backup images to internal disks, external disks, network drives, or free cloud(Google Drive, Dropbox, and OneDrive) and CD/DVD. It is suggested to save the images to the internal/external/network drives to save time as those kinds of disks have a better read-write speed. It is suggested NOT to save the image on the source disk, because once the disk is damaged, all the files on the disk will become unavailable and you will be unable to restore the image.

As a company network administrator, what features should I use to protect our internal computers?

It is recommended that you use the SQL Backup feature to back up your company's SQL server and Exchange Backup feature to back up the Exchange server. In addition, you can execute System Backup to back up the system and boot partitions on every computer and set a plan to execute the backup once a day or twice a week to ensure that the computer can be restored timely when it has boot issues. File Backup feature can be used to back up important user data. If there are a large quantity of computers, you can purchase EaseUS Backup Center to manage the backups on the client computers centrally.

About EaseUS Todo Backup

Be it a file, system, partition, or disk, EaseUS Todo Backup will help you back up or clone the item and provide you with multiple backup plans.