# Is there a way to query if one chunk has already been "initialized" (written to)? **URL:** \ **Category:** Hdf-forum archives\ **Created:** [February 13, 2012, 11:02am UTC](https://forum.hdfgroup.org/t/is-there-a-way-to-query-if-one-chunk-has-already-been-initialized-written-to/2465 "2012-02-13T11:02:37Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![Diot\_Sebastien](https://forum.hdfgroup.org/letter_avatar_proxy/v4/letter/d/8edcca/32.png) [@Diot\_Sebastien](https://forum.hdfgroup.org/u/Diot_Sebastien)\ **Post date:** [February 13, 2012, 11:02am UTC](https://forum.hdfgroup.org/t/is-there-a-way-to-query-if-one-chunk-has-already-been-initialized-written-to/2465/1 "2012-02-13T11:02:37Z")
If I have a (very) sparse dataset and I always write exactly whole chunks, is there a way for me to iterate over all the written chunks explicitly? Using a fill value is just not an option in my case. MfG / Regards, Sebastien Diot Grossblittersdorferstrasse 257-259 66119 Saarbruecken Germany Tel.: +49 (681) 8808-0 Fax.: +49 (681) 8808-300 E-Mail.: [s.diot@eurodata.de](mailto:s.diot@eurodata.de) > **···** > > ----------------------------------------------------- > EURO DATA GmbH & Co. KG > Datenverarbeitungsdienst > HR A 6448 Amtsgericht Saarbrücken > Komplementär: A. Reiß & Sohn GmbH > HR B 4965 Amtsgericht Saarbrücken > Geschäftsführer: Dipl.-Kfm. Karl-Heinz Siebenpfeiffer > -----------------------------------------------------