Question about using sra_toolkit to transform the SRA format into FASTQ format

[areyousad]

1.the raw data is the pair-end illumina GA2 data, but after the transformation
the result contains 3: xxxx_1.fastq,xxxx_2.fastq,xxxx.fastq,and the xxxx.fastq 's size is very small. Is that means xxxx.fastq is the unpaired reads?

2.I use the fastq-dump command, is that suitable to the sequencing value of illumina GA2? or I should try the illumina-dump...

I am a rookie. Thank you all guys in advance