- 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 QNAP 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 specific precautions to take while migrating data between NAS QNAP TVS-873 devices?
Yes, there are some precautions to take while migrating data between NAS QNAP TVS-873 devices. Here are a few important ones:
- Backup your data: Before starting the migration process, it is crucial to create a backup of all your important data. This ensures that even if something goes wrong during the migration, you still have a copy of your data.
- Check compatibility: Ensure that both the source and target QNAP TVS-873 devices are running compatible firmware versions. It is recommended to update the firmware to the latest version before starting the migration.
- Verify storage capacity: Make sure that the target QNAP TVS-873 device has enough storage capacity to accommodate all the data from the source device. Check the available storage space and plan accordingly.
- Network stability: Ensure that your network connection is stable and reliable during the migration process. Any interruptions or network issues can lead to data corruption or loss.
- Plan for downtime: Migrating data between NAS devices can take time, especially if you have a large amount of data. Plan for a maintenance window or downtime to perform the migration without any interruptions.
- Follow QNAP's migration guide: QNAP provides detailed migration guides for specific models. It is recommended to follow their official documentation and instructions for a smooth and successful migration process.
- Test after migration: Once the migration is complete, test the accessibility and functionality of your data on the new QNAP TVS-873 device. Ensure that all your files, applications, and services are working as expected.
By following these precautions, you can minimize the risk of data loss or corruption during the migration process.
How to take hard disks out of the NAS and connect them to a PC?
Although NAS TVS-873 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 QNAP TVS-873. 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 QNAP
TVS-873 has 8 HDD slots, and it supports the following array types:
- RAID 50;
- RAID 60;
- RAID 6;
- RAID 5;
- RAID 10;
- RAID 0;
- RAID 1;
- JBOD;
NAS supports:
- ZFS;
- EXT4;
- EXT3;
- exFAT;
- FAT32 (External Disk Only);
- NTFS (External Disk Only);
- HFS+ (External Disk Read Only);
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 QNAP TVS-873 network-attached storage keeps QTS (QuTS hero) 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 QNAP TVS-873 device can be attempted even if the storage disks have bad sectors. However, the success of the recovery process will depend on the severity of the bad sectors and the condition of the disks.
If the bad sectors are isolated and only a few, there are higher chances of successful data recovery. In such cases, data recovery software or specialized tools can be used to bypass the bad sectors and retrieve the data from the remaining good sectors.
However, if the disks have a large number of bad sectors or if they are physically damaged, the recovery process becomes more challenging. In such cases, it is recommended to seek professional data recovery services from specialized companies who have the expertise and equipment to recover data from damaged disks.
It is important to note that attempting data recovery on your own, especially if the disks are physically damaged, can further worsen the situation and potentially result in permanent data loss. Therefore, it is advisable to consult with experts in data recovery to maximize the chances of successful recovery.