- 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 TerraMaster 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 a NAS TerraMaster D5-330 D5 Thunderbolt3 device's caching policy impact data loss risks?
The caching policy of a NAS (Network Attached Storage) device like the TerraMaster D5-330 D5 Thunderbolt3 can impact data loss risks in the following ways:
- Write-back caching: This caching policy allows data to be written to the cache first and then gradually moved to the storage disks in the background. While this improves write performance, there is a risk of data loss if a power outage or system failure occurs before the data is completely written to the disks. In such cases, any data in the cache that has not been written to the disks may be lost.
- Write-through caching: This caching policy immediately writes data to both the cache and the storage disks simultaneously. This reduces the risk of data loss as the data is written to the disks right away. However, it may impact write performance compared to write-back caching.
- No caching: Some NAS devices may allow you to disable caching altogether. In this case, data is written directly to the storage disks without utilizing any cache. While this eliminates the risk of data loss due to cache failure or power outage, it might result in slower write performance compared to caching-enabled configurations.
It's important to note that caching policies are typically configurable on NAS devices, allowing users to choose the option that best suits their needs. However, it's crucial to understand the trade-offs between performance and data loss risks when selecting a caching policy. Additionally, implementing appropriate backup strategies and uninterruptible power supply (UPS) systems can help mitigate data loss risks regardless of the caching policy chosen.
How to take hard disks out of the NAS and connect them to a PC?
Although NAS D5-330 D5 Thunderbolt3 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 TerraMaster D5-330 D5 Thunderbolt3. 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.
D5-330 D5 Thunderbolt3 has 4 HDD slots, and it supports the following array types:
- RAID 0;
- RAID 1;
- RAID 5;
- RAID 6;
- 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 TerraMaster D5-330 D5 Thunderbolt3 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 TerraMaster D5-330 D5 Thunderbolt3 device can still be performed even if there are issues with the network interface card or port. The NAS device typically allows for direct connection to a computer via Thunderbolt or USB, bypassing the network interface. This means that even if the network interface is not functioning properly, you can still connect the NAS directly to a computer using Thunderbolt or USB and access the data.