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you cannot change or upgrade your HD to SSD. SSD is a technology in which storage medium is not a disk but a Memory chip just like USb flash drive.
However you can exchange your driver with SSD
Usually, it is not possible to upgrade the cpu on a laptop. In rare cases where it is possible the upgrade usually costs nearly as much as a new laptop.
However, you can significantly upgrade the laptop's performance by adding more memory and by replacing the old slow hard drive.
Your Sony VGN-Z250 is usually supplied with 3GB of RAM memory. You can replace the existing memory modules with a new kit consisting of 2 x 2GB modules (total 4GB). The type of memory you need is "SO-DIMM" (meaning laptop size) DDR3 - 1066MHz (you may use 1333MHz memory but it will only run at 1066MHz speed). I would suggest either G-Skill or Crucial brand memory. And you can replace the hard drive with an SSD. You'll be amazed at the boost this provides, seriously. I would suggest either Samsung 840 EVO or Sandisk Ultra for an SSD. Both offer super-fast performance compared to your old spinning hard drive, and both have very low power consumption so they run cool and give your laptop a few extra minutes of battery power. You can clone/copy your existing Windows setup onto the SSD using free Macrium Reflect software or free software from the SSD maker's website. Or, you can do a fresh install of Windows.
A 9.5 mm drive should work for that, as the 7mm are used mainly in Ultrabooks.
Step 2:
Physically switching out the drive should be no problem, there should be a drive access panel on the back that is accessible via a phillips head screwdriver. Simply take out the old drive and replace the new.
Step 3:
The main problem is copying the contents of the drive to your new SSD. If you want, you can buy a 2.5" harddrive to usb adapter, you can then clone the drive using the instructions found here Cloning. After you have cloned your drive, it should boot when you insert your SSD
SSD drives are only limited by whats available right now, and price. However your says its soldered according to these specs. but you should still verify.
This picture should help you identify the location of the SSD in the drive.dell website doesnt say anything about the SSD upgrade.You can check with them for the exact details.
SSD
WWAN Card
Memory
WLAN Card
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