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When to run fastq-dump --split-files -X 10000 ?

I am doing RNA-Seq data analysis of SRA data. I am not understanding the purpose of command

fastq-dump --split-files -X 10000

Why to split file? and if i don't know the data is paired end or single end. is there is need to use -X 10000 ?

Thanks in advance

next-gen sequencing rna-seq alignment assembly

1 answer

If you always use --split-files then you never have to worry about forgetting to use it with PE data. There is no reason to use -X 10000 unless you just want a subset of the reads for testing something quicker.

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