Daisy chaining would present a problem if you would like the space available on both the D and E drives to be represented as one drive, so that you could back up a huge amount of data and "span" both drives with one large file. To do this, you must look beyond daisy chaining to a RAID setup.
RAID, short for Redundant Array of Independent (or Inexpensive) Disks, is a technology that allows you to employ two or more hard drives in combination. These drives will appear to your system as one large volume. So if you have two 120GB hard drives in a RAID setup, they will appear to your system as one large 240GB drive.
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