On this page
01. What the warning means02. Safe steps03. Do not clear user data04. Prevent it05. Capacity06. A typical scenario07. Common mistakes08. Quick checklist09. Frequently asked questions
Download all punches into the software (or USB), back them up, then clear old attendance records from the terminal menu. Schedule regular downloads so it never fills.
Key takeaways
- Download before clearing.
- Back up the software database.
- Clear only old records.
- Download weekly to avoid this.
01What the warning means
The terminal has a fixed capacity for attendance records. When nearly full it warns. Past the limit it may overwrite or stop recording, depending on settings.
02Safe steps
- Download all punches (download guide).
- Check the transaction list in the software.
- Back up the database (backup).
- Take a USB copy as a second backup.
- On the terminal go to Menu > Data Mgt and delete attendance records (older ones if the option lets you choose).
03Do not clear user data
Make sure you choose attendance records, not users or fingerprints.
04Prevent it
- Download weekly or daily.
- Enable the low-capacity alert.
- Set a calendar reminder.
05Capacity
Capacity differs by model and variant. Confirm your K40 Pro's limits with the supplier.
06A typical scenario
A busy depot filled the terminal's memory and punches stopped saving for two days. A weekly download-and-clear routine with a calendar reminder prevented a repeat.
Illustrative example based on common cases, not a named customer.
07Common mistakes
- Clearing without downloading.
- Deleting users by mistake.
- Ignoring warnings.
- No reminders.
- Assuming it overwrites safely.
08Quick checklist
- Download
- Back up
- Clear attendance records only
- Check users remain
- Set a reminder
- Review monthly
09Frequently asked questions
How many punches fit?
It depends on the model. Check the spec sheet or ask us.
Will clearing records affect payroll?
Not if you downloaded and backed up first.
Can it overwrite old records?
Some firmware does. Do not rely on it.
Can I increase the memory?
No; downloading and clearing is the way.
This guide is part of our ZKTeco K40 and ZKBio Time.Net series. For the full start-to-finish walkthrough with screenshots, read How to Configure a ZKTeco K40 Pro with ZKBio Time.Net.
ZKTeco and ZKBio are trademarks of ZKTeco Inc. Menu names on the K40 Pro and in the software vary slightly by firmware and software version; where yours differ, look for the nearest match. Qyvea is a ZKTeco reseller and installer in Kenya.
