Slight confusion here.
You say you cannot find the USB lead and then say it is a Firewire drive!!
Whichever lead it requires USB or Firewire there are plenty of places from where you can buy replcement.
Not the least Maplins click here
Surface Pro 5 News - release date, UK price, features, specs
Animator Emanuele Kabu’s psychedelic video is a stunning tribute to Lisbon city
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Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.