# +KSLEEP command and its impact on NAND durability

**URL:** <https://forum.sierrawireless.com/t/ksleep-command-and-its-impact-on-nand-durability/8444>\
**Category:** Legacy HL Series\
**Created:** [February 19, 2016, 7:32pm UTC](https://forum.sierrawireless.com/t/ksleep-command-and-its-impact-on-nand-durability/8444 "2016-02-19T19:32:52Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![matiashek](https://avatars.discourse-cdn.com/v4/letter/m/dfb087/32.png) [@matiashek](https://forum.sierrawireless.com/u/matiashek)\
**Post date:** [February 19, 2016, 7:32pm UTC](https://forum.sierrawireless.com/t/ksleep-command-and-its-impact-on-nand-durability/8444/1 "2016-02-19T19:32:52Z")

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Hello,

According to the “HiLo AT Command Interface Specification” document, Appendix 5, I see that +KSLEEP command can write in flash memory.

But I do not understand how it works. I need to use both +KSLEEP=0 and +KSLEEP=1 commands in a specific cycle:

+KSLEEP=1  
pause  
+KSLEEP=0  
another AT commands  
pause  
+KSLEEP=1

Does anybody let me know if +KSLEEP always writes in flash something regardless of its parameter’s value being set?

Thank you a lot for any help and information.

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**Author:** ![Rex\_alex](https://avatars.discourse-cdn.com/v4/letter/r/73ab20/32.png) [@Rex\_alex](https://forum.sierrawireless.com/u/Rex_alex)\
**Post date:** [February 24, 2016, 9:10am UTC](https://forum.sierrawireless.com/t/ksleep-command-and-its-impact-on-nand-durability/8444/2 "2016-02-24T09:10:40Z")

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Hi,  
Restart the modem after giving AT+KSLEEP command. It will write into flash.

-Alex

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**Author:** ![matiashek](https://avatars.discourse-cdn.com/v4/letter/m/dfb087/32.png) [@matiashek](https://forum.sierrawireless.com/u/matiashek)\
**Post date:** [February 24, 2016, 10:00am UTC](https://forum.sierrawireless.com/t/ksleep-command-and-its-impact-on-nand-durability/8444/3 "2016-02-24T10:00:53Z")

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Thanks

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<div class="post-metadata">

**Author:** ![matiashek](https://avatars.discourse-cdn.com/v4/letter/m/dfb087/32.png) [@matiashek](https://forum.sierrawireless.com/u/matiashek)\
**Post date:** [February 24, 2016, 11:21am UTC](https://forum.sierrawireless.com/t/ksleep-command-and-its-impact-on-nand-durability/8444/4 "2016-02-24T11:21:57Z")

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Thanks