Note1
When using this hard disk drive model with TS-119 Turbo NAS, the hard disk drive temperature will be slightly higher.

Note2
As suggested by certain hard disk drive providers, the hard disk drives of the same brand and series are collectively recognized as compatible with QNAP products if the largest-capacity drive has passed the compatibility test.

Note3
If you are using two 1.5TB or 2TB hard disk drives in TS-209, due to an upper limit of the logical volume capacity, you can only configure the hard disk drives as single disk volumes or RAID 1 disk volume.

Note4 (WD RE4-GP WD2002FYPS)
For improved stability, you are suggested to contact Western Digital after Nov 15, 2009 for the new firmware upgrade. Please refer to http://files.qnap.com/download/Forum/WD_New_Firmware_Release.pdf

Note5 (WD Green & Seagate Green)
These hard disk drives have passed QNAP lab's initial verification of compatibility. However, because many users have reported unstable experience with these hard disk drives, we do not recommend using these hard disk drives with QNAP products. WD10EADS-00P8B0 and WD15EADS-00P8B0 are not suggested because of slow performance and stability issues.

Note6
To use these models with NMP-1000, please click here to download the hard disk drive compatibility update tool.

Note7 (Advanced Format)
To use these models with QNAP NAS, please upgrade the NAS firmware to v3.2.5 or later (TS-109/209/409: v3.2.0), backup the NAS data to another location, and then follow this guide to re-initialize the hard disk drives to adopt the WD Advanced Format Technology. Currently these hard disk drives are not compatible with QNAP NVR.

Note8 (Hitachi 7K1000.C HDS721010CLA332 1TB)
Since the design of the screw position of this hard disk drive model is slightly different from others, the hard disk drives of 2-bay and 4-bay Turbo NAS may not be detected properly. Please plug the hard disk drive tray into the drive bay until it clicks into place to avoid hard disk drive detection error.

Note9 (WD Desktop Hard Drives)
The hard disk drives have passed QNAP lab's initial verification of compatibility.
However, the manufacturer has suggested not to use the desktop hard disk drives in business-critical RAID environments because the drives may not work correctly. Please check this link for more information.

Note10 (Samsung HD204UI 2TB)
To use this hard disk model with QNAP products, please back up the disk data (if any) and follow the guide below to apply the patch for improved data integrity.
http://forums.seagate.com/t5/Samsung-Internal-Drives/HD204UI-Firmware-patch/m-p/143115#M20

Note11
QNAP NAS supports a disk volume of larger than 16TB. To use these models with QNAP NAS, please upgrade the NAS firmware to v3.4.0 or later. A disk volume of less than 16TB of storage can only be expanded to maximum 16TB by online RAID capacity expansion or adding hard drives. Online RAID capacity expansion and adding hard drives are not supported for a disk volume of over 16TB.

Note12 (3TB HDD)
Not applicable to TS-509 Pro.

Note13
Please update the NAS firmware to V3.4.4 and NVR firmware to V3.5.2 for enhanced compatibility with this hard drive model.

Note14
If a HDD SMART test is performed on a drive concurrently with data access, the drive might be ejected from the RAID volume. To solve this issue, please upgrade firmware to 3.6.3 or above.

Note15
These hard drives models have passed QNAP lab's compatibility verifications. However, some users have reported unstable experiences with these hard drives on older Turbo NAS firmware versions. Thus, we strongly suggest that users upgrade their Turbo NAS to firmware 3.7.1 or onward to improve compatibility. Users who still encounter issues after firmware upgrade are welcome to contact our tech support for direct assistance. The manufacturer also releases a new firmware version for these hard drive models. Please check this link for more information. Please be noticed this hard drive is desktop edition. To obtain the better system stability and reliability, we suggest using the business edition hard drive to build the RAID volume in the business environment.

Note16
These hard drives models have passed QNAP lab's compatibility verifications. However, some users have reported unstable experiences with these hard drives. Users who encounter any issues with these hard drive models are welcome to contact our tech support for direct assistance. The manufacturer has released a new firmware version for these hard drive models. Please check this link for more information.

Note17
Please upgrade the NAS firmware to 3.7.1  for enhanced compatibility with this hard drive model.

Note18 (3TB HDD)
Users can create a RAID volume larger than 16TB on the QNAP NVR. To use these hard drive models with the QNAP NVR, please update the NVR firmware to v3.5.1 or above. A RAID volume can be expanded to maximum 16TB by online RAID capacity expansion or adding hard drives. RAID volumes larger than 16TB cannot be expanded by these two features.

Note19
Please update the NVR firmware to V3.6.0 or above for enhanced compatibility with this hard drive model.

Note20
These hard drive models have passed QNAP lab's compatibility verifications. However, some users have reported unstable experiences with these hard drives on older Turbo NAS firmware versions. Thus, we strongly suggest that users upgrade their NVR to firmware 3.6.0 or onward to improve compatibility. Users who still encounter issues after firmware upgrade are welcome to contact our tech support for direct assistance. The manufacturer also releases a new firmware version for these hard drive models. Please check this link for more information. Please be advised that this hard drive is desktop edition. To obtain better system stability and reliability, we suggest using the business edition hard drive to build the RAID volume in the business environment.

Note21
Seagate ISE (Instant Secure Erase) function is not implemented.

Note22
Not recommended for TS-809 Pro/809U-RP Turbo NAS.