• Can I use larger hard drive(s) to expand the storage capacity on Synology Product (for DSM 2.2 and onward)?

    Yes. You can follow the steps below to replace the hard disks without losing your data. For one-bay models: Turn off the Synology Product. Replace the internal hard drive with a larger one. Turn on the Synology Product. Reinstall the system. Connect the replaced hard drive to the USB or eSATA port using external hard drive case. Copy th…


  • Does the eSATA port of Synology products support eSATA disk enclosures with port multipliers?

    Some Synology products come with eSATA port(s) for connecting external drives with the eSATA interface. Some disk enclosures utilize port multipliers to allow the installation of multiple hard drives in a single casing. However, please note that all Synology products do not support eSATA disk enclosures with port multipliers. Your hard drives installed on such devices might not be recogn…


  • How do NUMA and iSCSI over RDMA improve the performances of Synology FlashStation FS3017?

    Synology FlashStation FS3017 integrates the iSCSI over RDMA technology to boost iSCSI LUN performance. FS3017 also supports the NUMA technology, which is beneficial both to iSCSI and SMB network performance. iSCSI over RDMA, or iSCSI Extension for RDMA (iSER), is a computer network protocol that extends the iSCSI protocol to use Remote Direct Memory Access (RDMA). It requires the…


  • How can I recover data from my DiskStation using a PC?

    In the unfortunate event your DiskStation fails, you'll probably want to recover the data stored on its hard drives. Data stored on the DiskStation's hard drives can be easily recovered using an Ubuntu live CD and your computer. Please see the steps below. Prepare a PC with enough hard drive slots available to install the hard drives from your DiskStation. Remove t…


  • How can I use PhotoRec to recover files accidentally deleted from my Synology NAS?

    There are various tools for recovering data accidentally deleted from your Synology NAS. The free third-party software PhotoRec, for example, is especially suitable when you have only one hard drive or when you have a RAID 1 array with two hard drives. Please see the steps below to recover deleted files. Note: PhotoRec does not support…


  • How do I know when the internal hard drive of the Synology Product is full?

    You can know the usage status of the internal hard drive by receiving messages sent by the system or on DSM desktop notifications. To set the system messages, please go to Main Menu > Control Panel > Notification to enable email, SMS, or push notification services. You will thereby receive messages informing the usage status of the inter…


  • How do I enable file self-healing on DSM?

    Since DSM 6.1, the system is able to detect silent data corruption and repair the corrupted files in general cases with the file self-healing feature. The file self-healing feature is currently available for the shared folders located in a Btrfs volume which was created with one of the following RAID types: RAID 1 RAID 5 RAID 6…


  • Is it necessary to defragment the internal hard drive of the Synology Product?

    No. Disk defragmenter is mainly used for FAT file systems. Because the speed of reading files will decrease after the FAT system has run for a period of time, it is necessary to run disk defragmenter to rearrange data to speed up/accelerate the speed of reading files. It is not necessary to defragment the internal hard drive of the Synology Product because the Synology Prod…


  • Should I choose SAS or SATA solid-state drives for Synology FlashStation?

    Synology FlashStation is compatible to 2.5" SSDs with the SAS and SATA interfaces, both of which are similar in terms of drive performance but come with different features. We recommend reading through this article first before choosing the type of SSDs that suits your needs most. SAS SSD SAS SSD is mostly defined as enterprise-class product. In SAS regulation, it…


  • What is Synology Hybrid RAID (SHR)

    Overview Synology Hybrid RAID (SHR) is an automated RAID management system from Synology, designed to make storage volume deployment quick and easy. If you don't know much about RAID, SHR is recommended to set up the storage volume on your Synology NAS. You will learn differe…


  • What's the maximum file size Synology NAS supports (for DSM 3.0 and onward)?

    The EXT4 format which is used on the internal hard drive inside Synology NAS with DSM 3.0 and onward supports up to 16TB for a single file. For more details about EXT4 format, please refer to http://en.wikipedia.org/wiki/Ext4. Besides EXT4, external hard drives connecting to Synology NAS can also be formatted in FAT3…


  • Which Synology DiskStation/RackStation supports Seagate IronWolf Health Management?

    Seagate IronWolf Health Management (IHM) is a feature integrated in Synology DSM, allowing you to monitor the health status of the Seagate IronWolf™ and IronWolf Pro drives installed in Synology NAS. Seagate IHM monitors drive health status, provides suggested actions, and offers a higher accuracy in predicting drive failure. IHM is supported on specific Synology NAS models and on specif…


  • Which file system should I use to create a volume?

    The ext4 and Btrfs1 file systems are supported in DSM 6.0 and above. You can create a volume in either of these file systems according to your needs and preference. Below are our suggestions on which file system to use for creating a volume.…


  • Which models have limited support for Synology Hybrid RAID (SHR)?

    Synology Hybrid RAID (SHR) is an automated RAID management system, designed to simplify storage management, optimize storage capacity, and meet the needs of new users who are unfamiliar with RAID types. However, the models below do not fully support SHR: Models SHR Availab…


  • Why can't I repair a volume with a new hard drive with the same capacity?

    This usually happens when you replace the hard drive with a different brand and model. Mostly, the capacity of hard drives produced by different manufacturers differs, even though the hard drives are claimed to have the exact same capacity. We suggest replacing the hard drives either with the same brand and model or different brand and model but larger in capacity.…


  • Why does my SD card become read-only when unplugged from EDS14?

    Please always eject your SD card and USB storage device before unplugging them from the EDS14. Improper unplugging can result in file system corruption and storage abnormality. If your EDS14 system database is stored on an SD card, hotplugging may render your device read-only. To eject storage devices properly from EDS14, go to Control Panel > Devices and…


  • Why does my Synology NAS have a single volume size limitation?

    Owing to technical limitations, the size of a single volume is limited to 16, 108, or 200 terabytes (TB) on certain Synology NAS models1. However, you can install and utilize hard drives larger than this capacity by creating multiple volumes2 on RAID as long as each volume is below the m…


  • Why does my hard drive size appear smaller on Synology NAS?

    At Storage Manager > Volume, the hard drive size appears smaller than that claimed by the HDD manufacturer, because file systems (of Synology NAS or regular computers) adopt the binary definition of storage units while HDD manufacturers adopt the decimal definition. Decimal definition (adopted by HDD manufacturers): 1 TB…