The above Link i tired for downloading the DDSM dataset. I am able to download only single case.Iam not able to download entire dataset or entire volume at a time.
Try finding the same dataset on Google's dataset search engine. It has got a compilation of more than 25 million datasets. I think you'll find your required dataset as well.
Dear Sandhyarani S. This CBIS-DDSM (Curated Breast Imaging Subset of DDSM) is an updated and standardized version of the Digital Database for Screening Mammography (DDSM) dataset: https://wiki.cancerimagingarchive.net/display/Public/CBIS-DDSM#5e40bd1f79d64f04b40cac57ceca9272
The Mini-DDSM: When it comes to healthcare, public and private organisations alike are reluctant to share their "wealth” and the "oil" of the modern age, data (i.e., mammograms), with the scientific community (at least not without a long list of conditions and restrains) which is very unfortunate. Hence, seeing many posts asking on how to access the DDSM data set, I introduce the Mini-DDSM. It is the lightweight version of the popular DDSM (Digital Database for Screening Mammography) data set which currently is obsolete. To answer the nagging question why Mini-DDSM, it is important to know that the DDSM database has a website maintained at the University of South Florida for purposes of keeping it accessible on the web. However, image files are compressed with lossless JPEG (i.e., “.LJPEG”) encoding that are generated using a broken software (or at least an outdated tool as described on the DDSM website). CBIS-DDSM provides an alternative host of the original DDSM, but unfortunately, images are stripped from their original identification filename and from the age attribute. Therefore, we retrieved the images, down-sampled them and stored them in their respective classes in PNG format (for easy access) while maintaining the metadata. You do not need to sign up or provide your information, go to the following link and get it: https://www.kaggle.com/cheddad/miniddsm2