Disk monitoring and SMART with CrystalDiskInfo

When your computer starts to slow down, strange errors appear when copying files, or you hear odd noises from the hard drive, it's not always easy to tell if the problem is software or hardware. In many cases, the key lies in the condition of the storage drives, and that's where we come in. CrystalDiskInfo as a disk monitoring and SMART tool to anticipate failures. If you suspect a physical failure, it's advisable to consult guides on how to repair a hard drive before making drastic decisions.

With this free program you can see at a glance the health of your hard drives, SSDs and external drivesCheck its temperature, usage hours, data written (TBW), potential internal errors, and much more. All supported by technology. S.M.A.R.T. Integrated into virtually every modern hard drive, and with a simple interface that anyone can understand without being a technician. Furthermore, since SMART doesn't replace a backup, it's recommended. make backups periodic updates of your important data.

What is CrystalDiskInfo and how does SMART monitoring work?

CrystalDiskInfo is a Windows application designed to Read and interpret SMART parameters from HDD, SSD, and other drives. (such as USB flash drives or SD cards, if compatible). SMART stands for Self-Monitoring, Analysis and Reporting Technology, an internal system that the disks have to record their operation, errors and wear.

Thanks to this technology, the program is able to show you health indicators such as “Good”, “Caution” or “Bad”, along with technical data such as temperature, number of hours powered on, power cycles, sectors reassigned, read errors, rotation speed or amount of data written and read.

The great advantage is that CrystalDiskInfo It does not write anything to the disk or modify its data.It simply reads the information that the drive's firmware provides through SMART. This makes it a very safe diagnostic tool, as it doesn't alter the content or configuration of your drives.

It's important to understand that, although it is very reliable, It's not a crystal ball that can accurately predict when a record is going to die.What it does do is detect early symptoms (recurring errors, reallocated sectors, abnormal temperatures, high SSD wear, etc.) so you can react in time and make backups before the problem becomes irreversible.

Download, version types and installation on Windows

The safest way to get the program is download CrystalDiskInfo from the official Crystal Dew World / CrystalMark websiteAvoid third-party sources full of adware or malware installers, because it's not worth playing with the data on your disks.

The developer offers several editions of the same application, which differ mainly in their visual appearance and distribution format, but They all share the same SMART monitoring functionsThe most common things you'll find are:

• INSTALLER version (Vista-): a classic .exe file that installs the program on the system, compatible with Windows Vista and later (including Windows 11).
• ZIP version (XP-): portable distribution compressed in ZIP, designed for Use CrystalDiskInfo without installation from Windows XP onwards.
• Shizuku and Kurei Kei EditionsThese are skins with alternative characters and interfaces, but in terms of functions they are identical to the standard edition.

If you choose the portable ZIP version, when you unzip the file you will see several executables: DiskInfo32.exe (for 32-bit systems), DiskInfo64.exe (for 64-bit systems) and DiskInfoA64.exe (for computers with ARM processors and Windows). Simply run the one that corresponds to your architecture (to know what type of hard drive I have) so that the program opens without installation.

The advantage of this option is clear: You can copy CrystalDiskInfo to a USB drive and carry it with you to use on any computer (for example, a relative's PC that starts having disk problems), without leaving a trace on the system and without having to install anything. This is useful even if the computer is experiencing problems with a uninitialized external disk or similar problems.

First contact: interface and general condition of the disks

When you open CrystalDiskInfo for the first time, the application Detects all storage units connected to the computer that are SMART compatible: internal hard drives, SATA and NVMe SSDs, external USB drives, etc. At the top you'll see a row of tabs with the name and capacity of each drive; simply click on one of them to switch between drives.

The main area displays several blocks of information. The left side usually features a prominent box. Health conditionThis visually indicates whether the unit is working correctly or if there is cause for concern. Depending on the version, it may be displayed as:

• Text and blue color (Good): all SMART parameters are within normal limits.
• Yellow text and color (Caution)If reassigned sectors or degraded values ​​appear, it is advisable to make a backup and monitor the situation.
• Text and color red (Bad)The disc is clearly damaged and It can fail at any timeThe priority is to save the data.

Just below the health status appears the disk temperatureIt also uses color codes so you can immediately see if it's within an acceptable range. Under normal use, it should reasonably operate between 30°C and 45°C, although HDDs can tolerate slightly higher temperatures and NVMe SSDs can significantly exceed them if they aren't properly cooled.

On the right you will find basic information about the hard drive or SSD: name reported by the firmware (which sometimes does not match the commercial name), detected capacity, firmware version, serial number, interface type (SATA, NVMe, USB…), transfer mode (e.g., PCIe 3.0 x4 or SATA III 6 Gb/s), drive letter assigned by Windows, supported standard (ACS, NVMe, etc.) and a list of features (SMART, APM, NCQ, TRIM, DevSleep, etc.).

Further to the right, several data points appear that are especially useful for estimating wear: Total Host Reads / Total Host Writes (total amount of data read and written), number of ignitions (how many times the unit has been initialized), hours on (accumulated operating time) and, in the case of mechanical disks, Rotation speed in RPM.

The great advantage is that CrystalDiskInfo shows the cumulative amount of written data In the Total Host Writes section, and on many modern SSDs, it also displays a health percentage (e.g., 100%, 98%, 90%, 10%, etc.). When this percentage drops too low or the recorded TBW approaches the specification limit, it's worth considering... replace the unit or at least increase backups.

SMART parameters: how to interpret them without going crazy

The table at the bottom of the window is where CrystalDiskInfo displays the detailed SMART attributes of the unitAt first glance it may seem like a jumble of numbers, but there are really a few key fields worth keeping an eye on, and the rest is usually advanced information for more technical users.

Each row corresponds to an attribute (for example, read errors, reassigned sectors, temperature, power cycles, written data, etc.) and the columns usually include:

• ID: attribute identifier (hexadecimal or decimal).
• Current: current normalized value of the attribute.
• Meat: worst value recorded since the disk has been in use.
• Threshold: minimum safety threshold defined by the manufacturer.
• Raw values: “raw” value used internally by the disk (usually in decimal it is more understandable).

The key to avoiding confusion is to remember that Each manufacturer uses its own scaleSome models start at 100, others at 200, others at 253… Therefore, it makes no sense to obsess over whether “200 is high or low” in isolation. What matters is that The Current value remains above the ThresholdWhen it starts to get too close, or falls below it, it's a sign that this parameter is entering a dangerous zone.

In practice, the most interesting SMART attributes for the average user are usually:

• Reassigned / Pending SectorsA progressive increase in these values ​​indicates that the mechanical disc is experiencing physical problems on its surface.
• Unsafe Shutdowns: number of sudden shutdowns without going through a proper shutdown (power outages, hang-ups, cable pulls).
• Temperature: current operating temperature, to be monitored in poorly ventilated NVMe SSDs and HDDs.
• Total Host Writes / Reads: total data written and read, important for estimating the wear and tear of an SSD based on its TBW.
• Percentage of life remaining / internal health statusSome SSDs directly display a health percentage or an estimate of remaining lifespan.

In many cases, if a SMART attribute deviates from the norm, CrystalDiskInfo highlights it or changes the overall health status to "Caution" or "Bad", so you don't even need to interpret all the values ​​one by one if you don't want to complicate things too much.

SSD disk monitoring: TBW, wear and real health

In solid-state drives, the star parameter is the TBW (Terabytes Written)which indicates how many terabytes of data have been written over the SSD's lifetime. Each model has a TBW value estimated by the manufacturer (e.g., 150 TBW, 300 TBW, 600 TBW, etc.), and The closer you get to that figure, the greater the wear and tear on the cells.For details and specific tools, you can use utilities such as SSD Z.

CrystalDiskInfo helps you control this aspect because shows the cumulative amount of written data In the Total Host Writes section, and on many modern SSDs, a health percentage is also displayed (e.g., 100%, 98%, 90%, 10%, etc.). When this percentage drops too low or the recorded TBW approaches the specification limit, it's advisable to consider replacing the drive or, at least, increase the frequency of backups.

The good news is that, on SSDs, SMART parameters are quite accurate in reflecting the reality of wear and tear.These types of drives have no moving parts, so the monitoring of write cycles, cell errors, and bad blocks is reflected with relative accuracy in SMART. In fact, many official manufacturer programs (Samsung Magician, Crucial Storage Executive, WD Dashboard, Kingston SSD Manager, ADATA SSD Toolbox, etc.) rely on the same data to calculate their own percentage of remaining life.

That's why CrystalDiskInfo is especially reliable when it comes to monitor the health of an SSD and its operating temperatureIf you notice that the temperature is constantly rising or that wear is progressing very quickly compared to the expected TBW, it's a sign that something is wrong: poor ventilation, intensive 24/7 use, very heavy workloads, etc.

Monitoring mechanical hard drives: limitations and physical symptoms

The situation is somewhat different with traditional hard disk drives (HDDs). Although they also expose their data through SMART, Not all mechanical problems are immediately reflected in the attributesIt is perfectly possible that CrystalDiskInfo indicates that the disk is "Good", in blue, and yet the system starts to stutter, takes forever to open programs, or produces intermittent errors when reading certain files.

This happens because HDDs, having moving parts (platters, heads, motor), They may suffer gradual degradation of the surface or the mechanism which doesn't translate into reallocated sectors until the problem is more serious. Before that, you might notice:

• Rattling Noises: (unusual clicks, squeaks, buzzing sounds) when accessing data.
• Abnormal vibrations or changes in noise when slightly moving the PC tower.
• Very long delays when opening specific folders or files that used to flow smoothly.

In these cases, CrystalDiskInfo will only detect the problem when SMART logs clear errors (increasing reallocated sectors, recurring read errors, etc.). Until then, its diagnosis should be considered inaccurate. Informative but not definitive on mechanical hard drives. That's why it makes sense to combine CrystalDiskInfo with guides from hard drive maintenance and tools that analyze the disk surface, such as CHKDSK, HDDScan, or Victoria HDD.

Alarms, update frequency, and advanced options

One of the most useful features of CrystalDiskInfo is that it allows Configure automatic alerts when disk health or temperature deviates from normalThis way you don't have to be constantly monitoring it: the program itself alerts you if something goes wrong.

From the menu Function / Features You can adjust, among other things:

• Update frequency: how often are SMART data refreshed for all units or for a particular one.
• Temperature alarm thresholdsYou set the maximum degree level and the program will warn you if it is exceeded.
• Health status settingsYou can customize which values ​​the program considers dangerous (reassigned sectors, pending sectors, remaining life, etc.).
• Temperature scale: possibility of viewing the data in ºC or ºF, as you prefer.
• Raw values: switch between hexadecimal and decimal format (10 is recommended for better understanding of the numbers).
• Background behavior: choose whether you want it to minimize to the system tray, start with Windows, etc.
• Advanced detection options: disk search in Intel RAID (CSMI), AMD RAID, USB/IEEE 1394, ATA Pass Through, etc.

In addition, the program allows hide serial number It displays the drives on screen (useful if you're taking screenshots) and offers some special features, such as AAM/APM control (advanced power and noise management) on certain drive models. These options are designed more for advanced users; if you're not sure what you're doing, it's best to leave these settings at their factory defaults.

What to do if CrystalDiskInfo does not detect a disk or shows errors

In most cases, when opening the program All connected units appear automaticallyHowever, it is possible that an external hard drive, a newly installed SSD, or a drive connected via a special controller may not appear in the list.

Before panicking, it's worth reviewing several basic points: Check the power and data cablesVerify that the drive appears in the BIOS/UEFI, ensure it is formatted and assigned a drive letter in Windows, and of course, update CrystalDiskInfo to the latest version from the official website, as newer versions usually improve compatibility with recent controllers and firmware. If a USB formatting errorThere are specific guides for trying to regain access without losing data.

If everything is correct and the unit does not appear, you can go to the menu Features > Redetect to force a new device scan. This is especially useful if you're hot-plugging and unplugging drives (for example, in a home NAS, a test station, or when using quick-swap bays).

When the program does detect the unit but It shows the status as “Unknown”This is usually because the manufacturer doesn't properly display the SMART data or because the controller used (for example, some cheap USB adapters) doesn't transmit the complete information. In these cases, CrystalDiskInfo can do little more than display what it receives, so if you need reliable data, it's best to connect the drive directly to the motherboard or use a quality adapter with genuine SMART support.

If the health status changes to “Caution” or “Poor”, or if the SMART data indicates clear errors, The first step is always to back up your important filesAfter that, you can use tools like CHKDSK, official manufacturer utilities, or programs like HDDScan or Hard Disk Sentinel to try to isolate damaged sectors, confirm the diagnosis, and decide whether it's worth continuing to use the drive or replacing it.

Good practices to keep your discs healthy for longer

Beyond checking your disk health with CrystalDiskInfo periodically, there are a number of simple habits that greatly help to extend the lifespan of hard drives and SSDs and reduce the risk of losing data due to an unexpected failure.

The first thing is to control the temperature: although the discs are designed to work hot, Excessive heat accelerates wear and tearThis applies to both HDDs and SSDs. Keep the inside of the tower clean of dust, ensure decent airflow, and avoid placing the computer next to radiators, windows in direct sunlight, or enclosed spaces where heat accumulates.

On laptops or computers with mechanical hard drives, it is important Avoid bumps and sudden movements while the disc is working.An impact at the wrong time can cause corrupted writes, damaged sectors, or even a complete system failure. Frequent backups minimize the damage if something like this happens.

Another key point is leave some free space on the drivesKeeping your hard drive 98-99% full not only kills performance, but can also cause overheating and complicate internal system maintenance tasks (such as TRIM on SSDs or file reorganization). Ideally, you should maintain between 10% and 20% free space.

Regarding maintenance, in the Periodic defragmentation is indeed useful for mechanical HDDs. To improve performance, this practice is pointless with SSDs and can even shorten their lifespan by generating unnecessary writes. For SSDs, it's best to use the manufacturer's official tools, which usually include optimization features, firmware updates, and specific checks.

Other tools that complement CrystalDiskInfo

Although CrystalDiskInfo covers the part of SMART monitoring and general health controlIt may be interesting to combine it with other programs that add diagnostic functions, performance tests, or even repair options.

Among the most prominent alternatives are:

• HD Tune: simple and visual, it allows you to see the health status, perform basic benchmarks and scan the surface for slow or damaged sectors.
• Hard Disk Sentinel: one of the most complete solutions for monitoring disks, with detailed reports, stress tests and advanced alert systems.
• HWiNFO and Speccy: geared towards hardware in general, they show very complete system information including temperature, model and status of the units.
• G Smart Control: graphical interface for smartmontools, widely used in Linux but with a version for Windows, focused on SMART testing and monitoring.
• Samsung Magician, WD Dashboard, Crucial Storage Executive, etc.Manufacturer-specific tools, ideal for getting the most out of your SSDs and obtaining diagnostics fully aligned with their firmware.
• Open Hardware Monitor: an open source project that monitors temperatures, voltages, fans and can also display basic disk information.

In environments where large volumes of data are handled (servers, NAS, heavy-duty PCs), it is highly recommended combine CrystalDiskInfo with one of these solutions to have both the SMART vision and the performance and surface testing aspects well covered.

Regularly using CrystalDiskInfo to monitor the health and temperature of your drives, checking the TBW and estimated lifespan of SSDs, and being aware of any changes in SMART status, combined with good ventilation, backup, and maintenance practices, makes it much less likely that a disk failure will catch you by surprise at the worst possible time, when you need your data the most.