Tab Delimited, Multiple Sample (TDMS) Format

TDMS files encapsulate the expression data from multiple samples into a single tab delimited file. Each sample represented in the file will have a single dedicated column that contains the expression data for that sample. Each row, below the header rows, represents information relating to a particular spot on the slide.
TDMS is very popular data format.It can be either affymetrix data or cDNA data. TDMS contains one or more header rows.Every column is seperated by a tab. Every row contains the express value for one gene at a different experiment.
A sample data file is displayed as following.
GeneIDSomeAnnotationSample1Sample2
gene1 annotation 0.22 0.42