- Why can’t ordinary software tools restore files from RAID?
- How to take hard disks out of the NAS and connect them to a PC?
Why can’t ordinary software tools restore files from RAID?
Conventional hard disks keep user’s data by writing it to their surface in a consecutive way, and this is how an entire file is stored on a single hard disk. However, when data is written to a RAID system, a file is divided into several parts. Then these parts are written consecutively to all hard disks within such array. The size of such parts may range from 2 KB to 2 MB, so each file is stored on several hard disks at the same time.
Such approach helps to speed up read and write operations, and it is evident that saving two parts of a file having the size of 1 GB to two hard disks simultaneously is much faster than saving the same 1 GB of data to one hard disk. However, this peculiarity makes file recovery more complicated.
Various RAID levels store information in different ways. Additionally, manufacturers like Digiever also introduce some modifications to this process, and that is why data can be written to hard disk in a wide variety of ways.
Are there any recommended practices for regular testing and validation of data backups to prevent potential loss on NAS Digiever DS-4225 UHD devices?
Yes, there are several recommended practices for regularly testing and validating data backups on NAS Digiever DS-4225 UHD devices to prevent potential loss. Here are some of them:
- Implement a backup schedule: Set up a regular backup schedule to ensure that your data is consistently backed up. This can be done daily, weekly, or monthly, depending on your requirements.
- Use multiple backup destinations: It is recommended to create multiple backup destinations, such as external hard drives, cloud storage, or another NAS device. This helps to ensure redundancy and increases the chances of data recovery in case of a failure.
- Perform regular test restores: Regularly perform test restores to ensure that your backup data is intact and can be successfully restored. This will help you identify any issues with the backup process or data corruption before an actual data loss event occurs.
- Monitor backup status: Keep an eye on the backup status and log reports provided by the Digiever DS-4225 UHD device. This will help you identify any backup failures or errors and take necessary actions to resolve them.
- Verify backup integrity: Use the built-in data integrity verification features provided by the Digiever DS-4225 UHD device to ensure that the backup data is not corrupted or tampered with.
- Regularly update firmware and software: Keep the firmware and software of your Digiever DS-4225 UHD device up to date. This helps to ensure that you have the latest security patches and bug fixes, reducing the risk of data loss due to vulnerabilities.
- Regularly review and update backup policies: Periodically review your backup policies and adjust them based on changes in your data storage and business requirements. This will help you ensure that your backup strategy remains effective and aligned with your needs.
By following these recommended practices, you can minimize the risk of potential data loss on NAS Digiever DS-4225 UHD devices and ensure the availability of your important data.
How to take hard disks out of the NAS and connect them to a PC?
Although NAS DS-4225 UHD can be accessed over the network, you still need to take the hard disks out of the storage device and connect them to a Windows computer. Only in this case will the software be able to scan them properly. Here is what you should do:
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Turn off the storage and disconnect it from the power supply.
WARNING! Before you start taking hard disks out of your NAS device, read the manual carefully. Incorrect actions may damage your network-attached storage and/or the hard disks within the RAID system.
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Take the hard disks out of the NAS one by one, carefully removing them from their slots. Remember that the disks are extremely vulnerable: hitting or dropping them may result in serious physical damage.
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Make sure to mark each hard disk in accordance with how they were installed inside the NAS.
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Remove the hard disks and connect them to the computer. In this video, we have explored what ports are used to connect hard disks, and what to do if there are not enough ports or connectors.
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Restoring data with Hetman RAID Recovery
This program recovers data from damaged RAID arrays and is fully compatible with Digiever DS-4225 UHD. The hard disks that make up the RAID contain technical information about the algorithm used to save files. When launched, Hetman RAID Recovery reads this information and puts the damaged array together. Then you can open the disk and save your files. Also, you can recover the files accidentally deleted from the network drive.
How to recover data from a Digiever
DS-4225 UHD has 4 HDD slots, and it supports the following array types:
- RAID 0;
- RAID 1;
- RAID 5;
- RAID 6;
- JBOD;
NAS supports:
- exFAT, VFAT, FAT 12 / 16 / 32;
- NTFS / ReFS;
- APFS / HFS+;
- Ext2 / 3 / 4 / ReiserFS / XFS / UFS / ZFS / Btrfs;
- VMFS / HikvisionFS;
Safe recovery from disk images
This utility lets you save an entire copy of the disk to file and then work with this image instead of the actual disk. Such feature helps to protect data on the disk from:
- Overwriting during the recovery process;
- Loss resulting from bad sectors;
- User mistakes.
To create an image, do the following:
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Make sure that you have enough free space to save the image. The image file size usually equals the disk size.
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Select the disk in the main window, and choose from the menu Tools – Save Disk. You can select multiple disks to be saved.
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When the image creation wizard starts, you can choose to save the entire disk or select only a part of it. Specify the parameters and click Next.
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At this stage, you need to choose a directory where to save the image. Choose any disk connected to this PC, or save the image by FTP.
Where are user’s files stored?
The Digiever DS-4225 UHD network-attached storage keeps OS Linux operating system files on a separate RAID 1 (mirrored) array. Usually, all NAS systems create several volumes on every hard disk, and the first of them takes up to 2 Gb of space. This is where operating system files are stored. Other volumes are united into a RAID array where user’s data is written.
Comparison of software for RAID recovery
| Product | Operating system | License type | RAID controller support | Supported file systems | Virtual RAID controller support | Data recovery from damaged RAID | File preview |
|---|---|---|---|---|---|---|---|
| Hetman RAID Recovery | Windows | Paid | Yes, over 100 controllers | FAT, NTFS, Ext2/3/4, HFS+ | Yes | Yes | Yes |
| DiskInternals RAID Recovery | Windows | Paid | Yes, over 100 controllers | FAT, NTFS, Ext2/3/4, HFS+ | No | Yes | Yes |
| R-Studio | Windows, Mac, Linux | Paid | Yes, over 200 controllers | FAT, NTFS, Ext2/3/4, HFS+ | Yes | Yes | Yes |
| UFS Explorer RAID Recovery | Windows, Mac, Linux | Paid | Yes, over 1,000 controllers | FAT, NTFS, Ext2/3/4, HFS+ | Yes | Yes | Yes |
| EaseUS Data Recovery | Windows | Paid | Yes, over 20 controllers | FAT, NTFS, Ext2/3/4, HFS+ | No | Yes | Yes |
| ReclaiMe Free RAID Recovery | Windows | Free | Yes, over 100 controllers | FAT, NTFS, Ext2/3/4, HFS+ | Yes | Yes | Yes |
Yes, data recovery from a NAS Digiever DS-4225 UHD device can be performed even if there are issues with the firmware or device settings. In such cases, it is advisable to contact the manufacturer's technical support or a professional data recovery service. They can guide you through the process of recovering the data by either troubleshooting the firmware or accessing the device through alternative means. It is important to note that attempting data recovery without proper knowledge or expertise can potentially cause further damage to the device or data.