Shared Drive or X-Ray Folder Missing at the Front Desk? Causes and Fixes for 2026
Monday morning, the front desk opens File Explorer to file a scanned insurance card and the S: drive has a red X on it. Open Dental stops at a window asking for a folder path, or the imaging program says it cannot find images. The computer next to it looks fine. Someone suggests saving the scans to the desktop "for now."
This guide covers the connection between a workstation and the shared folder. If the folder opens but images will not load inside the imaging program, the bridge between programs is the likelier cause; our dental imaging integration troubleshooting guide covers that layer.
In this guide
- Is it one computer or every computer?
- What can the front desk check before calling IT?
- What do the error messages mean?
- Why do mapped drives and X-ray folders disappear?
- Why does it matter where files are saved?
- What should you not do while the drive is missing?
- When should you call dental IT about a missing drive?
- How does IT stop shared drives disappearing?
- What to ask your IT provider about shared drives
- How Legend Networking can help
- Frequently asked questions
- The bottom line
Is it one computer or every computer?
Check a second workstation first. If the shared drive and the X-ray folder open on other computers, the server is fine and the problem is the one computer's connection or saved sign-in. If no computer can open them, the server, the storage box or the network is down, and only IT should touch it.
| What you see | Most likely cause | Next step |
|---|---|---|
| One computer has a red X; others open the drive | That computer reconnected too early or lost its saved password | Double-click the drive, then restart once |
| Every computer has lost the drive | Server or storage box off, restarting or failing | Call IT now; do not touch the server |
| Drive opens but one folder is missing | Permissions changed, or the folder was moved or renamed | Call IT; do not create a new folder with the same name |
| Drive opens, files have strange names or will not open | Possible security incident | Stop, leave the computer as it is, call IT immediately |
| Practice software opens; images or documents do not | The software cannot reach its image folder | Note the exact message and call IT |
| Only Wi-Fi laptops lose the drive | Wireless drops | See our guide to Wi-Fi that keeps dropping |
Write down which computers fail and which work. That one line saves the first ten minutes of the call.
What can the front desk check before calling IT?
Staff can check four things without an administrator password: whether another computer opens the drive, whether double-clicking the drive in File Explorer reconnects it, whether the computer is on the network at all, and whether one restart brings it back. Do not touch the server or the storage box, and do not type passwords into unexpected pop-ups.
Five checks before you call (about 10 minutes)
- 1Try another computerOpen the same drive or folder on a second workstation. If it works there, the server is fine and the problem is the first computer.
- 2Double-click the driveIn File Explorer, double-click the drive with the red X. Windows sometimes reconnects it on the spot if the network was not ready when you signed in.
- 3Check the networkCan this computer open a web page or the practice software? If not, the cable, the Wi-Fi or the network is down, and the drive is only a symptom.
- 4Restart onceUse Start, Power, Restart, not Shut down. Sign in and open the drive again before opening the practice software.
- 5Write down the exact messageTake a photo of the error, the drive letter or folder name, and which computers work and which do not.
Restart rather than shut down, because a normal shutdown keeps part of the old Windows session; our guide to restart vs power-cycle explains why and lists what staff should never switch off.
What do the error messages mean?
Most messages say the same thing in different words: this computer cannot reach the folder on the server. The useful detail is which program says it and whether other computers see the same.
| Message or sign | Where you see it | What it usually means |
|---|---|---|
| Red X on the drive letter | File Explorer | The drive is mapped but this computer is not connected to it right now |
| "Could not reconnect all network drives." | Windows notification after sign-in | Windows tried to reconnect the drive before the network was ready, or the server did not answer |
| "The network path was not found" (0x80070035) | Windows, opening the drive or folder | The computer cannot reach the server or storage box by that name, or Windows has refused the connection |
| "The cryptographic signature is invalid" or a message about blocked "unauthenticated guest access" | Windows 11, opening an older storage box | Windows' newer security defaults refuse the box's connection (see below) |
| "Could not find the path to the AtoZ folder" | Open Dental | Open Dental cannot reach its images and documents folder on this computer |
| The Edit Paths window opens when Open Dental starts | Open Dental | The saved folder path is invalid from this computer, often a Windows permission problem |
| "Cannot allocate surrogate display memory" | XDR imaging | The workstation cannot reach the PatientImages folder on the server |
Microsoft documents the red X and the "Could not reconnect all network drives" notification in its article on mapped drives that fail to reconnect; its workaround is a sign-in script that retries the connection, a job for IT.
For Open Dental, the A to Z Folder manual page lists "Could not find the path to the AtoZ folder" with the solution "Verify the data path to the A to Z folder is correct on the Data Paths window." The Data Paths page says that when Edit Paths appears after a working setup, "This is likely a Windows permission error," and its fix is to browse to the shared folder in Windows, enter the network username and password, and click OK in Edit Paths without changing anything. Leave that to IT if you do not have the network password.
Imaging programs have their own versions. XDR's knowledge base, for example, says its "Cannot allocate surrogate display memory" message means the workstation "cannot reach the PatientImages folder on the server," and suggests browsing to that folder in Windows to test the connection (XDR KB, 1 July 2025).
Why do mapped drives and X-ray folders disappear?
Drives vanish for a handful of reasons, each with a clear sign and a permanent fix.
Signed in before the network was ready
This is the commonest one-computer case, especially on laptops and Wi-Fi. Windows reconnects drive letters at sign-in, and if the network is not up yet, the drive shows a red X until someone opens it. Microsoft's note on its own workaround says it "works only for the device that has network access at logon." Cabling the computer and a retry at sign-in usually fix it for good.
Drive letters instead of server paths
Open Dental's manual is blunt: "A path to a mapped network drive (e.g., Z:\OpenDentImages\) is not recommended," because "Mapped drives must be set up on each computer and sometimes computers fail to properly remap the drive on startup." It recommends a path that "starts with \\SERVER\ or similar." The same page lists two more causes: if the server has a changing network address, "an issue would arise every time the IP address changes at restart," and "DNS issues could cause problems linking the server name to the server IP address." These are set-up fixes for IT.
A password changed
If the drive was connected with a saved username and password and that password changed, every computer with the old one saved loses the drive at the next restart. Open Dental's manual notes the same thing when "Remember my credentials is not checked." The fix is to update the saved sign-in, which IT does.
Windows 11 and older storage boxes
Some offices keep scans, exports or an imaging archive on a small network storage box rather than a server. In Windows 11 version 24H2, Microsoft changed two defaults: "By default, SMB signing is required on all connections," and "Guest fallback is disabled on Windows 11 Pro edition" (Microsoft Storage blog, 29 May 2024, updated 14 June 2024). Older boxes that do not sign connections, or that allow guest access without a password, stop opening on updated computers, with messages including "The network path was not found." Microsoft's preferred fixes are on the box: enable signing, turn off guest access, set a username and password, update its firmware, or replace it. Turning the protection off on the computers is the last resort, and it weakens security.
The server restarted or is out of space
If every computer loses the drive at the same moment, the server or storage box may be restarting for updates, may have stopped a service, or may be full. That is IT's to check. A server that restarts during patient hours on its own is worth raising, because updates should be scheduled after hours.
Why does it matter where files are saved?
Files saved on the shared drive are on the server, which is backed up and reachable from every computer. Files saved on a desktop exist on one computer only, are usually outside the backup, and disappear if that computer fails or is replaced. That is why "save to the desktop for now" is the workaround to avoid.
| What staff save | Where it belongs | Why |
|---|---|---|
| X-rays and intraoral photos | The imaging program, which stores them on the server or imaging store | Linked to the patient chart; covered by the server backup |
| Scanned insurance cards, IDs, EOBs, signed consents | The practice software's document area, or the agreed shared folder | One copy everyone can find, included in backups |
| Exports for labs, surgeons or insurers | The agreed shared folder, deleted once sent | Kept off desktops and personal email |
| Practice forms and templates | The shared drive | One current version for every computer |
| Anything with patient details | Never the desktop, a USB stick or personal cloud storage | Outside backups and outside the practice's control |
If you do not know where the agreed folder is, ask IT to write it down for each type of document. Our guide to dental backup solutions explains what a practice backup should cover, and the backup and recovery page explains how it is done.
What should you not do while the drive is missing?
Most lasting damage comes from workarounds: files saved where nobody can find them later, a second copy of a folder that splits the records, or a password typed into a prompt that was not from IT.
Six things not to do
- Do not save scans, X-rays or documents to the desktop or a USB stick "for now": they will be missing from the chart and the backup
- Do not map the drive yourself with a different letter or create a new folder with the same name
- Do not restart, unplug or log in to the server or the storage box
- Do not type administrator or network passwords into pop-ups you did not expect
- Do not copy the imaging folder to another computer to "get it working"
- Do not open, rename or move files that suddenly have strange names or will not open: leave the computer as it is and call
The last point matters most: files that suddenly will not open, or that have new names or extensions, can be a sign of ransomware, and restarting or copying can make recovery harder.
When should you call dental IT about a missing drive?
Call your IT provider when more than one computer has lost the drive, when one computer still cannot open it after a restart, when the practice software asks for a folder path, when images will not load, or when files look wrong. Call immediately if imaging, charting or checkout is blocked, or if anything suggests a security problem.
When you call, give four facts: which computers fail and which work, the drive letter or folder name, the exact message (a photo helps), and what you already tried. Our ticket checklist has a short template.
What IT usually does next, mostly remotely:
- Checks the server or storage box is up, has space and is sharing the folder.
- Reconnects the drive on the affected computer and updates any saved sign-in.
- Points the practice and imaging software at a server path rather than a drive letter, where the vendor recommends it.
- Fixes the storage box's security settings or plans its replacement if Windows 11 has cut it off.
If images open in Windows but not in the imaging program, the imaging integration troubleshooting guide helps sort out who owns the fix.
How does IT stop shared drives disappearing?
The permanent fixes are set-up choices, and each one closes off one of the causes above.
| Set-up | What it prevents |
|---|---|
| Server paths (\\SERVER\folder) in the practice and imaging software | Drive letters that fail to reconnect at sign-in |
| A fixed (reserved) network address and correct name lookup for the server | Every computer losing the server after a restart |
| Sign-ins managed centrally rather than typed and saved on each computer | Drives vanishing after a password change |
| Cables to front-desk and imaging computers | Drives dropping with the Wi-Fi |
| Storage boxes that support signed connections and require a password | Windows 11 refusing the connection |
| Server updates and restarts scheduled after hours, with monitoring | Drives disappearing mid-morning |
What to ask your IT provider about shared drives
Ask these at your next review, or after the second time a drive goes missing.
Paths and sign-ins
- Does our practice and imaging software use a server path or a drive letter, and which does the vendor recommend?
- What happens to the shared drive on every computer when a password changes?
Storage
- Is anything stored on an older network storage box, and does it work with Windows 11's current security defaults?
- Is everything on the shared drive and the imaging store included in the backup, and when was a restore last tested?
Habits
- Where should staff save each type of document, written down for the office?
- How would you know if files were being saved to desktops instead?
The contract
- Is one copy of the backup kept offline or air-gapped, out of reach of ransomware that can see the shared drive?
- When an image path has to be changed with the imaging or practice software vendor, is that call included in our monthly fee?
- Do we have a signed business associate agreement (BAA) with you, since you manage the server that holds our X-rays and scanned documents?
How Legend Networking can help
Legend Networking has 22+ years in dental IT and has served over 3,500 practices since 2004. Legend supports the IT environment around Dentrix, Eaglesoft, Open Dental and Archy, and around the imaging systems DEXIS, Vatech, Carestream, Planmeca/Romexis and Dolphin Imaging, which is where shared folders and image paths are set. Practices reach a staffed 24/7 helpdesk at 1-800-794-1588, with in-house engineers and no outsourced first-level triage, backed by 24/7 monitoring.
The author, Ian Lynch, has 22 years in dental IT and oversees the NOC, onsite dispatch and client technology roadmaps. Legend holds a 4.8 rating from 173 Google reviews.
Frequently asked questions
Why does my mapped drive show a red X?
A red X means the drive is set up on this computer but not connected right now. The usual reasons are that Windows tried to reconnect before the network was ready, a saved password changed, or the server is unavailable. Double-click the drive to reconnect it, restart once if that fails, and check whether other computers can open it before you call IT.
What does "Could not reconnect all network drives" mean?
It is a Windows notification that one or more mapped drives did not reconnect when you signed in. Microsoft documents it alongside the red X. Often the network was not ready at sign-in, and opening the drive reconnects it. If it appears every morning, ask IT to add a reconnect at sign-in or switch the software to server paths.
Why can one computer see the shared drive and another cannot?
If one computer opens it, the server and the folder are fine. The other computer has lost its connection: it signed in before its network was ready, has an old saved password, cannot find the server by name, or is on Wi-Fi that dropped. Restart it once, then call IT with both computer names and the exact message.
What does "Could not find the path to the AtoZ folder" mean in Open Dental?
It means Open Dental on that computer cannot reach its A to Z folder, where it keeps images and documents. Open Dental's manual says to verify the data path on the Data Paths window. If other computers open images, the folder is fine and the problem is this computer's connection or permission. Call IT rather than changing the path yourself.
Why did our storage box stop working after a Windows 11 update?
Windows 11 version 24H2 requires signed connections and turns off guest access on Pro editions by default. Older network storage boxes that do not sign connections, or that allow access without a password, stop opening, often with "The network path was not found." Microsoft recommends fixing the box: enable signing, require a password, update its firmware, or replace it.
Can we save scans to the desktop until the drive is back?
It is better not to. Files on a desktop exist on that computer only, are usually outside the backup, and are easy to forget once the drive returns. If you must keep working, ask IT where to save temporarily and how the files will be moved. Never use a USB stick or personal cloud storage for anything with patient details.
Are our X-rays lost if the X-ray folder is missing?
Almost always not. A missing folder usually means a computer cannot reach the server where the images are stored, not that the images were deleted. Do not copy, rename or recreate folders while you wait, because that can split the records. Call IT, who can check the server and confirm the images are intact and backed up.
Should we use a network drive or a cloud folder for practice files?
Either can work, provided everyone saves in one agreed place, access needs a sign-in, and the location is included in backups. A server or network drive suits offices with on-site practice or imaging software. Many cloud-based offices use cloud storage instead. What matters is that files are not on individual desktops. Ask IT which suits your set-up.
The bottom line
Ask your IT provider for a one-page list of where each type of document is saved, which drive letter or folder name staff should see, and what to do when it disappears. Keep it at the front desk with the helpdesk number. If drives keep vanishing, a Free Dental IT Assessment covers your computers, software, network security, backups and performance. To see how a dental IT helpdesk handles a missing drive, read about the Legend helpdesk.