Re: [Dorset] Using shred

Hi Terry, > > /dev/urandom can be quite slow for large amounts. > > OK. I'll try the second drive with zeros. No, I'd stick to /dev/urandom if you don't want to do that cat(1) method since it's slow, but probably not as slow as writing over USB 2.0 to spinning rust. Who knows, perhaps the

Re: [Dorset] Using shred

On Sunday, 18 February 2018 11:16:04 GMT Ralph Corderoy wrote: > dd(1) is quick. It read(2)s a block of bytes and write(2)s that block. > The kernel does the transfer of bytes from the device to dd's memory and > vica versa. If you don't choose a block size then it might be quite > small, > >

Re: [Dorset] Using shred

Hi Terry, > I think that it's more likely to be the interface. The drive is a > Seagate ST31000523AS, which has a SATA speed of 6 GB/s, a Transfer > Speed of 600 MB/s and a Sustained Data Rate of 125 MB/s. I'd expect read to be different to write? And if they only give one figure then it's the

Re: [Dorset] Using shred

Hi Terry, > The above link also suggests that dd is the longest method. dd(1) is quick. It read(2)s a block of bytes and write(2)s that block. The kernel does the transfer of bytes from the device to dd's memory and vica versa. If you don't choose a block size then it might be quite small,

Re: [Dorset] Using shred

Try Again. This seems to happen when people cc me as well as sending the response to the list. My mail client helpfully suppresses the original and only sends me the duplicate, which I then reply to On Sunday, 18 February 2018 09:49:55 GMT PeterMerchant via dorset wrote: > I have an idle

Re: [Dorset] Using shred

On Sunday, 18 February 2018 08:48:00 GMT Hamish MB wrote: > You could well be being limited by your disks speed then. 100GB per hours is > pretty fast for a HDD. Can you connect two at once to speed it up? I think that it's more likely to be the interface. The drive is a Seagate ST31000523AS,

Re: [Dorset] Using shred

On 18/02/18 08:48, Hamish MB wrote: You could well be being limited by your disks speed then. 100GB per hours is pretty fast for a HDD. Can you connect two at once to speed it up? Hamish On 18 Feb 2018, at 08:45, Terry Coles > wrote: On

Re: [Dorset] Using shred

You could well be being limited by your disks speed then. 100GB per hours is pretty fast for a HDD. Can you connect two at once to speed it up? Hamish On 18 Feb 2018, at 08:45, Terry Coles > wrote: On Sunday, 18 February 2018 07:59:30 GMT

Re: [Dorset] Using shred

On Sunday, 18 February 2018 07:59:30 GMT Terry Coles wrote: > It seems to be pretty quick having reached 22 GB done in around 40 minutes. Of course, if I was any good at basic arithmetic, I would have known that this is no quicker than shred. It just passed 100 GB after about an hour; 1000 GB

Re: [Dorset] Using shred

On Saturday, 17 February 2018 23:56:31 GMT Ralph Corderoy wrote: > The NAS offered a `reformat'? How long did it take? It's part of the build process. The NAS offers Raid 0, Raid 1, etc and as part of the process formats the drives. It seems to be a special format in D-Link boxes, because

Re: [Dorset] Using shred

On Saturday, 17 February 2018 19:22:05 GMT Hamish MB wrote: > For modern drives a single pass with zeros is usually just fine. You can use > dd if=/dev/zero of=/Dev/sdxy > You could copy from /Dev/urandom for a quicker random number pass too. Hamish, I did find some information that told me

Re: [Dorset] Using shred

Hi Terry, > I have reformatted the drives in-situ The NAS offered a `reformat'? How long did it take? > My PC is in the bedroom, so I'd rather not run it overnight. Kill it off then start from scratch tomorrow morning, assuming ten hours for a disk? > I suspect that part of the problem is

Re: [Dorset] Using shred

For modern drives a single pass with zeros is usually just fine. You can use dd if=/dev/zero of=/Dev/sdxy You could copy from /Dev/urandom for a quicker random number pass too. Hamish On 17 Feb 2018, at 18:38, Keith Edmunds > wrote: On Sat, 17

Re: [Dorset] Using shred

On Saturday, 17 February 2018 18:36:34 GMT Keith Edmunds wrote: > On Sat, 17 Feb 2018 18:31:53 +, d-...@hadrian-way.co.uk said: > > I'd be happier if there was no chance of data recovery. > > Then destroy the drives. I want to sell them with the NAS Box. I do know about hammers :-) --

Re: [Dorset] Using shred

On Sat, 17 Feb 2018 18:31:53 +, d-...@hadrian-way.co.uk said: > I'd be happier if there was no chance of data recovery. Then destroy the drives. -- "Laughter is the best medicine, though it tends not to work in the case of impotence" - Jo Brand -- Next meeting: Bournemouth, Tuesday,

Re: [Dorset] Using shred

On Saturday, 17 February 2018 17:56:45 GMT Keith Edmunds wrote: > Shred is slow. No one will trivially read the ex-data following a > reformat. I suppose if the drive used to hold your plans for world > domination, a few more hours of shred is a small price to pay. However, > if the drive only

Re: [Dorset] Using shred

Shred is slow. No one will trivially read the ex-data following a reformat. I suppose if the drive used to hold your plans for world domination, a few more hours of shred is a small price to pay. However, if the drive only held data of interest to you and you don't want the PC running overnight,

[Dorset] Using shred

Hi, I am retiring my old D-Link Sharecenter NAS with a view to flogging it on eBay. Clearly, I want to ensure the data has been completely scrubbed off the two 1TB drives. I have reformatted the drives in-situ, but felt that I should do more than that, so I've removed the drives and am