Why do some second-generation sequencing use G and some use reads to indicate sequencing depth?

In the second generation sequencing, G is Gb, which is the same as the Gb of the hard disk. Because of the large amount of data, how many grams are generally used to get the basic data of life sequencing. Readings refer to short sequences and short segments read out. Generally speaking, the sorting depth is expressed by a number plus a multiplication symbol, such as 100X. It means that the effective basic data actually obtained by sequencing is more than the actual basic data of the template.

The second generation sequencing technology can help to find new therapeutic targets, which can be new targets in new genes or drug-resistant targets in known genes. It can also help patients choose better treatment methods, which is particularly important in the era of targeted therapy and immunotherapy; Finally, it can also help predict the recurrence of cancer and screen early cancer.

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