Western Digital−53%
Western Digital My Book external hard drive 4 TB 3.5" Micro-USB B 3.2 Gen 1 (3.1 Gen 1) Black
£187.99£400
at Back to the OfficeView deal →Western Digital: My Book external hard drive 4 TB 3.5" Mi vs My Passport external hard drive 4 GB 2.5
Two tech & gaming deals from Western Digital, side by side · prices checked 10 Nov 2026
Western Digital−20%
Western Digital My Passport external hard drive 4 GB 2.5" USB Type-C 3.2 Gen 1 (3.1 Gen 1) Black
£199.99£248.70
at Back to the OfficeView deal →| My Book external hard drive 4 TB 3.5" Mi | My Passport external hard drive 4 GB 2.5 | |
|---|---|---|
| Price today | £187.99 | £199.99 |
| Previous price | £400 (Amazon price) | £248.70 (Amazon price) |
| Discount | 53% | 20% |
| You save | £212.01 | £48.71 |
| Retailer | Back to the Office | Back to the Office |
The short version: the My Book external hard drive 4 TB 3.5" Mi is the cheaper of the two at £187.99 (£12 less than the My Passport external hard drive 4 GB 2.5). The bigger discount is on the My Book external hard drive 4 TB 3.5" Mi at 53% off its amazon price. So the same product wins on both price and saving. Both prices were checked this morning and link straight to the retailer.