- 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 Netgear also introduce some modifications to this process, and that is why data can be written to hard disk in a wide variety of ways.
How can RAID (Redundant Array of Independent Disks) configurations impact data loss in NAS Netgear ReadyNAS RR4360X devices?
RAID configurations can have a significant impact on data loss in NAS Netgear ReadyNAS RR4360X devices. Here are a few ways RAID can affect data loss:
- Redundancy: RAID configurations like RAID 1, RAID 5, and RAID 6 offer redundancy by distributing data across multiple disks. If one disk fails, the data can be reconstructed using the remaining disks. This redundancy helps protect against data loss in case of disk failures.
- Fault tolerance: RAID configurations with parity, such as RAID 5 and RAID 6, use parity information to reconstruct data in case of disk failures. This fault tolerance ensures that even if one or more disks fail, the data can still be recovered without loss.
- Hot-swap capability: Many NAS devices, including the Netgear ReadyNAS RR4360X, support hot-swapping of disks. This means that if a disk fails, it can be replaced without shutting down the system. The RAID configuration can automatically rebuild the data onto the new disk, minimizing the risk of data loss.
- Performance impact: Depending on the RAID configuration, there may be a performance impact on the NAS device. For example, RAID 5 and RAID 6 configurations require additional processing power to calculate parity information, which can slightly reduce performance. However, this performance impact does not directly impact data loss.
- RAID controller failure: In some cases, the RAID controller itself can fail, leading to potential data loss. It is important to ensure that the RAID controller is reliable and has redundant components to minimize this risk.
It is worth noting that while RAID configurations can provide protection against certain types of data loss, they are not foolproof. Other factors like accidental deletions, software errors, or multiple disk failures can still result in data loss. It is recommended to have regular backups and implement additional data protection measures to further mitigate the risk of data loss.
How to take hard disks out of the NAS and connect them to a PC?
Although NAS ReadyNAS RR4360X 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 Netgear ReadyNAS RR4360X. 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 Netgear
ReadyNAS RR4360X has 12 HDD slots, and it supports the following array types:
- RAID 0;
- X-RAID;
- RAID 1;
- RAID 5;
- RAID 6;
- RAID 50;
- RAID 60;
- JBOD;
NAS supports:
- Ext2;
- Ext3;
- Ext4;
- Btrfs;
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 Netgear ReadyNAS RR4360X 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, there are several software tools available for data recovery from NAS Netgear ReadyNAS RR4360X. Some popular options include:
It's important to note that data recovery from NAS devices can be a complex process, and it's recommended to seek professional assistance if you're not familiar with the recovery process. Additionally, it's crucial to stop using the NAS device immediately after data loss to prevent further data overwriting.