Hello,

At least some versions of HDFView worked so that they opened .h5 data files in 
read-write mode and, when closing, re-wrote the headers(?) of the data file 
even though the user thought that no changes were needed. That could cause data 
loss if the format of the datafile was not interpreted correctly in the first 
place.

My question is: How does the read-write mode behave, nowadays, in terms of 
re-writing things or leaving them intact?   When closing a file opened in 
read-write mode, does the HDF5 library write something only when there are 
changes or does it always re-write headers?

Thanks and regards,
Vesa Paatero
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