If you have valuable data on the drive you'll need to use another computer to make a Linux Live Bootable USB and attempt Data Recovery. See here for more details:
Once this is done you need to purchase a new drive. A SSD is recommended as it'll substantially boost your system's performance. Vendors such as Crucial list compatible upgrades for the Inspiron 3520:
Once the SSD is installed you'll need to create Windows 10 Installation Media using another computer and the use this to clean install Windows 10 on your new SSD. See here for details:
robert p
4 Operator
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9.4K Posts
0
March 2nd, 2018 05:00
Hi StratCat57,
Thanks for posting. Apologies your system isn't performing as expected.
Hard drives can be purchased from a variety of places. Some are:
Dell Spare Parts, Parts-People.com, or Discount Electronics.
Here is a video from parts-people.com you may find helpful:
Dell Inspiron 3520 Hard Drive Replacement Video Tutorial
Philip_Yip
9 Legend
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16.1K Posts
0
March 2nd, 2018 05:00
If you have valuable data on the drive you'll need to use another computer to make a Linux Live Bootable USB and attempt Data Recovery. See here for more details:
http://dellwindowsreinstallationguide.com/data-recovery-using-fedora/
Once this is done you need to purchase a new drive. A SSD is recommended as it'll substantially boost your system's performance. Vendors such as Crucial list compatible upgrades for the Inspiron 3520:
http://uk.crucial.com/gbr/en/compatible-upgrade-for/Dell/inspiron-3520
The Dell User Manual instructs on physically replacing the drive:
http://downloads.dell.com/Manuals/all-products/esuprt_laptop/esuprt_inspiron_laptop/inspiron-15-3520_service%20manual_en-us.pdf
Once the SSD is installed you'll need to create Windows 10 Installation Media using another computer and the use this to clean install Windows 10 on your new SSD. See here for details:
http://dellwindowsreinstallationguide.com/windows-oem-faqs-and-downloads/#V1709