How to Test New Hard Drives Before Adding to NAS

New hard drives fail at a higher rate in their first 6-12 months of operation than at any other point in their rated lifespan. This early failure period is called infant mortality and is a well-documented phenomenon in hard drive reliability data. Drives that will fail early typically show SMART errors or surface defects within the first few hundred hours of operation. Testing a new drive before adding it to a NAS RAID array catches these failures while the drive is still under warranty and before it can cause data loss. The process takes between 3 and 24 hours depending on drive capacity and testing depth, and requires no specialised tools beyond what is built into Synology DSM, QNAP QTS, or free Windows software.

Why New Drives Need Testing

The bathtub curve is the standard model for hard drive failure probability over time. It has three phases:

• Infant mortality (0-12 months): Elevated failure rate from manufacturing defects, shipping damage, and marginal components that slip through quality control. Drives that survive this period are typically reliable for years.
• Useful life (1-5 years): The flat bottom of the curve. Failure rate is at its lowest. Most drives operate reliably during this period.
• Wearout phase (5+ years): Failure rate rises again as mechanical components accumulate wear, head alignment degrades, and bearing wear increases.

The infant mortality period matters for NAS builds because a new 4-bay NAS with four untested drives has all four drives in the elevated-failure period simultaneously. If one drive fails and the RAID array enters a rebuild, a second drive failing during that rebuild destroys the array in RAID 5. Testing before installation catches the failures that will happen anyway, and catches them under controlled conditions while the drive is still returnable.

What testing catches:

• Surface defects: sectors that fail on the first full read, indicating platter damage from shipping or marginal manufacturing
• Reallocated sectors: sectors the drive has already identified as defective and mapped to spare area. Any reallocated sectors on a brand new drive is a defect worth returning.
• Pending sectors: sectors flagged for reallocation that have not yet been successfully rewritten
• Electronics and firmware faults: drives that produce errors, disconnect, or report impossible SMART values often have electronic faults that will cause early failure

NAS-grade drives like the Seagate IronWolf (from around $199 for 4TB) and WD Red Plus carry 3-year warranties that cover replacement. The warranty does not cover the cost of professional data recovery in Australia, which starts at $500 for logical failures and can reach $5,000 or more for physical RAID recovery. Testing takes a few hours. Data recovery takes weeks and costs thousands.

Step 1: Inspect the Drive Physically

Before connecting the drive, inspect the packaging and the drive itself. Hard drives are sensitive to shock during shipping, and couriers are rough with packages.

What to check:

• Packaging integrity: crushed corners, obvious impact damage, or an audible rattle from inside the box indicating a loose component
• Drive case: dents, scratches, or deformation on the drive enclosure itself
• SATA connector: bent or damaged pins on the SATA data or power connector
• Label: verify the model number against what you ordered; confirm the capacity; confirm whether the drive is CMR or SMR using the model number against community lists if recording technology matters for your use case

Photograph any packaging damage before proceeding. If the drive fails testing and you need to return it, photographic evidence of shipping damage strengthens the claim. Under Australian Consumer Law, if a product arrives damaged or defective, the retailer is responsible for return shipping costs and replacement or refund.

Step 2: Run the SMART Quick Test

The SMART quick test (also called a short self-test) is a 1-5 minute test run by the drive's own firmware. It checks the drive's internal circuitry, the servo mechanism, and a sample of the drive surface. It will not catch all surface defects but will immediately identify drives with obvious electronic or servo failures.

On Synology DSM:

1. Open Storage Manager from the main DSM menu.
2. Select the HDD/SSD tab.
3. Click on the drive you want to test.
4. Select Health Info.
5. Choose Quick Test and click Run.

The test completes in approximately 2-5 minutes. The result is Pass or Fail. A Fail result on the quick test means the drive has a significant fault and should be returned. Do not add a failed drive to the NAS.

On QNAP QTS:

1. Open Storage and Snapshots from the QTS main menu.
2. Select Storage, then Disks.
3. Click on the drive, then select S.M.A.R.T. Test.
4. Choose Short Test and click Start.

On Windows (before installing in the NAS): Connect the drive via USB-to-SATA adapter or install temporarily in a PC. Open CrystalDiskInfo (free, from crystalmark.info) and check the Health Status. A yellow Caution or red Bad state indicates an immediate problem. For manufacturer-specific tests, use SeaTools for Desktop for Seagate drives or WD Dashboard for WD drives, and run the Short DST test.

Both Synology and QNAP allow SMART tests on drives installed in bays that have not yet been assigned to a storage pool. Install the drive, run the test, then create the pool once all drives have passed.

Step 3: Run the Extended SMART Self-Test

The SMART extended self-test (also called a long self-test) is a comprehensive test run by the drive's firmware that reads every sector on the drive surface and tests the head, actuator, and electronics under sustained load. It takes 3-20 hours depending on drive capacity. For a 4TB drive, expect 3-6 hours. For a 12TB drive, expect 12-18 hours. This is the most important single test to run on a new drive and should be completed before the drive enters service.

On Synology DSM:

1. Open Storage Manager > HDD/SSD tab.
2. Click the drive, then Health Info.
3. Choose Extended Test and click Run.
4. DSM will notify by email (if configured) when the test completes. Results appear in the Health Info tab.

On QNAP QTS:

1. Open Storage and Snapshots > Storage > Disks.
2. Select the drive, then S.M.A.R.T. Test.
3. Choose Extended Test and click Start.
4. QTS will notify on completion via the notification system.

On Windows: Use SeaTools for Desktop (run the Long Generic test), WD Dashboard (run the Extended test), or CrystalDiskInfo (Tools > Start Long Test). All three initiate the drive's own extended self-test.

Interpreting results: A pass result with no SMART errors is the expected outcome for a healthy new drive. Any of the following in the post-test SMART attribute report are failure indicators for a drive sold as new:

• Reallocated Sectors Count (attribute 5) above 0: The drive has already remapped defective sectors. This is a defective product.
• Reallocated Event Count (attribute 196) above 0: Same implication as above.
• Current Pending Sectors (attribute 197) above 0: Sectors flagged for reallocation that the drive has not yet successfully rewritten.
• Uncorrectable Sector Count (attribute 198) above 0: Sectors that could not be read and could not be reallocated.

Step 4: Check the SMART Baseline Before Installing

After completing the extended self-test, read the full SMART attribute set for the drive and save the values as a baseline. This baseline is useful if the drive develops problems later and you need to determine whether a problem is new or pre-existing.

The most important SMART attributes to record:

• Attribute 5 (Reallocated Sectors Count): Should be 0 on a new drive.
• Attribute 9 (Power On Hours): Should be under 50 hours on a genuinely new drive. A drive showing 500+ power-on hours at the time of purchase is a refurbished or previously returned unit being sold as new, which warrants an immediate return to the retailer.
• Attribute 12 (Power Cycle Count): Should be very low on a new drive. A high power cycle count combined with significant power-on hours on a drive sold as new is a clear red flag.
• Attribute 187 (Reported Uncorrectable Errors): Should be 0.
• Attribute 197 (Current Pending Sectors): Should be 0.
• Attribute 198 (Uncorrectable Sector Count): Should be 0.

Save this data as a screenshot from CrystalDiskInfo, DSM Health Info, or the manufacturer tool. If the drive develops problems later, having the baseline makes it clear what the drive's state was when new, which directly supports any warranty claim with the retailer.

Step 5: Optional Full Surface Scan

A full surface scan reads every sector of the drive at the operating system level, independent of the drive's own firmware. It is the most thorough test because it exercises the drive under real-world read conditions and can catch surface defects the drive's self-test may not expose. For most home NAS builds, the SMART extended test combined with the NAS platform's health check is sufficient. For anyone building a NAS that will hold irreplaceable data or will not have an offsite backup immediately available, the surface scan adds meaningful confidence.

On Windows: Victoria (free) and HD Tune (free basic version) both provide graphical surface scan capability. Victoria maps the full drive surface and colour-codes sectors by read speed and error status, providing a visual representation that is immediately interpretable. Download from the official developer sites.

On Synology via SSH (advanced): Enable SSH in Control Panel > Terminal and SNMP > Terminal. Connect via SSH client. Run badblocks -n -v /dev/sdX 2>&1 | tee badblocks_output.txt where X is the drive letter (use lsblk to identify the correct device). The -n flag runs a non-destructive read-write test. Any errors reported indicate surface defects. This test takes 6-24 hours for a 4-12TB drive and should not be run on a drive that is already part of an active storage pool.

Time considerations: A full surface scan on a 4TB drive at typical HDD read speed takes approximately 6-8 hours. On a 12TB drive, 18-24 hours. Run this test overnight or over a weekend. It does not require supervision once started.

Troubleshooting: What to Do When a Test Fails

Drive fails the quick SMART test: Do not use this drive. Power it down, repackage it, and return it to the retailer. A drive that fails its own self-test within the warranty period is a clear defective product. Under Australian Consumer Law, the retailer must replace or refund it. Bring the SMART test result as documentation: a screenshot from DSM or the diagnostic tool output is sufficient.

Drive shows non-zero reallocated sectors on a new drive: Return it. A drive with reallocated sectors is not suitable for a NAS RAID array, regardless of whether it otherwise appears functional. Do not accept a retailer argument that the drive is still within specification: any reallocated sector on a new drive is a manufacturing defect.

Drive shows pending sectors but passes the extended test: This is a borderline case. If pending sectors resolve after the extended test (the count goes to 0 after the test rewrites those sectors), the drive may be acceptable for use. If pending sectors remain after the extended test, return the drive.

Drive disconnects or disappears during testing: A drive that disconnects from the NAS or PC during testing has a significant electronics or firmware fault. Power cycle the drive and retry. If it disconnects again, return it. Do not attempt to add an intermittently disconnecting drive to a RAID array.

Test takes significantly longer than expected: Hard surface drive test time scales with data density, and any slow-reading sectors add time. A test taking 2-3x longer than the manufacturer's estimated test duration may indicate marginal surface areas. After the extended test completes, examine SMART attributes 187, 197, and 198 closely before deciding whether to proceed.

Do I really need to test new drives if they come with a 3-year warranty?

Yes, because the warranty covers the drive hardware, not your data. If an untested drive fails six weeks after installation during a RAID rebuild and takes an adjacent drive with it, the warranty will replace the drives. It will not recover your data, and professional RAID data recovery in Australia starts at $3,000 for physical failures. The 6-20 hours spent testing new drives before installation is a fraction of the cost of a single data recovery event. Testing is the cheap insurance that the warranty does not provide.

How long does drive testing take for a typical NAS build?

A SMART quick test takes 2-5 minutes per drive. A SMART extended self-test takes 3-20 hours per drive depending on capacity: roughly 3-6 hours for a 4TB drive, 6-12 hours for an 8-10TB drive, and 12-18 hours for a 12-16TB drive. For a 4-bay NAS with 4TB drives, testing all four drives sequentially takes 12-24 hours. If you have a PC with multiple SATA ports available, testing two drives simultaneously halves the calendar time. The testing does not require active supervision once started.

Can I run the SMART tests inside the NAS before setting up the RAID?

Yes, and this is the recommended approach for Synology and QNAP NAS. Install the drive in the NAS bay without creating a storage pool. In Synology DSM, the drive appears in Storage Manager > HDD/SSD as an unassigned drive and you can run Health tests on it directly. QNAP QTS similarly allows SMART tests on drives not yet assigned to any storage pool. Running the test in the NAS is convenient and avoids needing a separate PC or USB adapter. Do not create the storage pool until all drives have been tested and passed.

What is CrystalDiskInfo and where do I get it?

CrystalDiskInfo is a free Windows tool that reads and displays SMART data from any connected hard drive or SSD. It provides a Health Status rating (Good, Caution, Bad) based on SMART attribute values and displays all individual SMART attributes with current and worst-case values. It is the most widely used free drive health tool for Windows users. Download it from the developer's official site (crystalmark.info) or from reputable software repositories like Ninite. Always download from an official source rather than third-party download sites.

Should I run the extended test on SSDs as well as hard drives?

Yes, for any SSD being added to a NAS storage pool or SSD cache. SMART extended tests on SSDs complete much faster than on hard drives, typically 5-30 minutes rather than hours. The same principle applies: a new SSD with reallocated sectors, pending sectors, or uncorrectable errors is a defective unit that should be returned. SSD failures in the infant mortality period are less common than with hard drives but do occur, and catching them before the SSD is in active NAS use is always preferable to discovering the problem after data has been written to the drive.

Can I test drives I bought from a marketplace seller?

Yes, and you should, with extra attention to the Power On Hours SMART attribute. A drive described as new that shows 500+ power-on hours is a previously used drive being sold as new. Drives sourced from non-primary retail channels carry additional risk of being refurbished, returned, or previously used. If the SMART data shows signs of prior use, this is grounds for a return under Australian Consumer Law, which applies to any business seller operating in Australia regardless of the stock origin. Screenshot the SMART data and the original product listing before contacting the seller.