[gdal-dev] Unable to write in subdataset

[Cole, Derek]

Hello,

I have created an image with multiple subdatasets so that I may store two images in my NITF. the way I am getting the data set of the second image  is like so:

char **papszSubdatasets = GDALGetMetadata(sharpenedDS,"SUBDATASETS");
         eraserDS = (GDALDataset *) GDALOpenShared(CSLFetchNameValue(papszSubdatasets, "SUBDATASET_2_NAME") , GA_ReadOnly );
         eraserBand = eraserDS->GetRasterBand(1);

(this is after checking to make sure that the first DS has more than one subdataset)

According to CPL_DEBUG, the GDALOpenShared works correctly and opens the file as NITF.

However, at some points in my code, I am getting this thrown to console presumably where I am using the band's RasterIO method to GF_Write.

ERROR 3: Unable to write 2097152 byte block from 8302649793.
ERROR 1: An error occured while writing a dirty block

What do these error messages mean? I mam getting a ton of them. the block is the same number of bytes, but the "from" changes in each instance of the error.
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